KYIV, Ukraine (AP) — Powerful explosions rocked a Russian air base in Crimea and sent towering clouds of smoke over the landscape Tuesday in what may mark an escalation of the war in Ukraine. At least one person was killed and several others were wounded, authorities said.

Russia’s Defense Ministry denied the Saki base on the Black Sea had been shelled and said instead that munitions had blown up there. But Ukrainian social networks were abuzz with speculation that it was hit by Ukrainian-fired long-range missiles.

Videos posted on social networks showed sunbathers on nearby beaches fleeing as huge flames and pillars of smoke rose over the horizon from multiple points, accompanied by loud booms. Crimea Today News said on Telegram that witnesses reported fire on a runway and damage to nearby homes as a result of what it said were dozens of blasts.

Russia’s state news agency Tass quoted an unidentified ministry source as saying the explosions’ primary cause appeared to be a “violation of fire safety requirements.” The ministry said no warplanes were damaged.

Ukraine’s Defense Ministry said sarcastically on Facebook: “The Ministry of Defense of Ukraine cannot establish the cause of the fire, but once again recalls the rules of fire safety and the prohibition of smoking in unspecified places.”

A presidential adviser, Oleksiy Arestovych, said cryptically in his regular online interview that the blasts were caused either by a Ukrainian-made long-range weapon or were the work of partisans operating in Crimea.

During the war, Russia has reported numerous fires and explosions at munitions storage sites on its territory near the Ukrainian border, blaming some of them on Ukrainian strikes. Ukrainian authorities have mostly remained mum about the incidents.

If Ukrainian forces were, in fact, responsible for the blasts at the air base, it would be the first known major attack on a Russian military site on the Crimean Peninsula, which the Kremlin annexed in 2014. A smaller explosion last month at the headquarters of Russia’s Black Sea Fleet in the Crimean port of Sevastopol was blamed on Ukrainian saboteurs using a makeshift drone.

Russian warplanes have used the Saki base to strike areas in Ukraine’s south on short notice.

One person was killed, said Crimea’s regional leader, Sergei Aksyonov. Crimean health authorities said nine people were wounded, one of whom remained hospitalized. Others were treated for cuts from shards of glass and released.

Officials in Moscow have long warned Ukraine that any attack on Crimea would trigger massive retaliation, including strikes on “decision-making centers” in Kyiv.

For his part, Ukraine’s president vowed to retake Crimea from Russia.

“This Russian war against Ukraine and against all of free Europe began with Crimea and must end with Crimea — its liberation,” President Volodymyr Zelenskyy said Tuesday in his nightly video address. “Today it is impossible to say when this will happen. But we are constantly adding the necessary components to the formula for the liberation of Crimea.”

Earlier Tuesday, Ukrainian officials reported at least three Ukrainian civilians were killed and 23 wounded by Russian shelling in 24 hours, including an attack not far from the Russian-occupied Zaporizhzhia nuclear power plant.

The Russians fired over 120 rockets at the town of Nikopol, across the Dnieper River from the plant, Dnipropetrovsk Gov. Valentyn Reznichenko said. Several apartment buildings and industrial sites were damaged, he said.

Ukraine and Russia have accused each other of shelling the power station, Europe’s biggest nuclear plant, stoking international fears of a catastrophe.

The governor of the region where the plant is situated, Oleksandr Starukh, said Tuesday that radiation levels were normal. But he warned that an accident could spread radiation whichever way the wind blows, carrying it to Moscow and other Russian cities.

A Russian-installed official in the partially occupied Zaporizhzhia region said an air defense system at the plant would be reinforced in the aftermath of last week’s shelling. Evgeny Balitsky, head of the Kremlin-backed administration, told Russian state TV that power lines and other damaged portions of the plant were restored.

The Ukrainians in recent weeks have been mounting counterattacks in Russian-occupied areas of southern Ukraine while trying to hold off the Kremlin’s forces in the industrial Donbas region in the east.

Also Tuesday, a U.S. official said Iran has agreed to supply Russia with drones for use in the war in Ukraine. The official, speaking on the condition of anonymity to discuss sensitive information, said “during the last several weeks, Russian officials conducted training in Iran as part of the agreement for UAV transfers from Iran to Russia.”

The White House released satellite images in mid-July indicating that Russians had visited an Iranian airbase to see weapons-capable drones. But U.S. officials said later that month that they had seen no evidence yet of Iran supplying Russia with the drones.

Ukrainian officials this month said Iran has transferred drones to Russia and some have been used in combat.

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Associated Press writer Chris Megerian in Washington contributed to this report.

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Follow AP’s coverage of the war in Ukraine at https://apnews.com/hub/russia-ukraine

Police announced a breakthrough Tuesday in the killings of four Muslim men in Albuquerque, New Mexico, charging a man from Afghanistan — himself a Muslim — with two of the slayings and identifying him as a prime suspect in the other killings that put the entire community on edge.

Muhammad Syed, 51, was taken into custody a day earlier after a traffic stop more than 100 miles away, authorities said.

Police Chief Harold Medina said it was not clear yet whether the deaths should be classified as hate crimes or serial killings.

Investigators received a tip from the city’s Muslim community that pointed toward Syed, who has lived in the U.S. for about five years, police said.

Police were looking into possible motives, including an unspecified “interpersonal conflict.”

When asked specifically if Syed, a Sunni Muslim, was angry that his daughter married a Shiite Muslim, Deputy Police Cmdr. Kyle Hartsock did not respond directly. He said “motives are still being explored fully to understand what they are.”

Ahmad Assed, president of the Islamic Center of New Mexico, cautioned against coming to any conclusions about the motivation of the suspect, who he said attended the center’s mosque “from time to time.”

“Knowing where we were, you know, a few days ago to where we are today is an incredible sigh of relief that we’re breathing,” he said. “Lives have been turned upside down.”

The exact nature of the relationships between Syed and the victims – and the victims to one another – remained unclear. But police said they continue to investigate how they crossed paths before the shootings.

The slayings drew the attention of President Joe Biden, who said such attacks “have no place in America.” They also sent a shudder through Muslim communities across the U.S. Some people questioned their safety and limited their movements.

When told about the announcement, Muhammad Imtiaz Hussain, brother of one of the victims, Muhammad Afzaal Hussain, said he felt relieved but needed to know more about the suspect and the motive.

“This gives us hope that we will have (the) truth come out,” he said. “We need to know why.”

It was not immediately clear whether Syed had an attorney who could speak on his behalf.

Naeem Hussain was killed Friday night, and the three other men died in ambush shootings. Three of the four slayings happened in the last two weeks.

Hussain, 25, was from Pakistan. His death came just days after those of Muhammad Afzaal Hussain, 27, and Aftab Hussein, 41, who were also from Pakistan and members of the same mosque.

The earliest case involves the November killing of Mohammad Ahmadi, 62, from Afghanistan.

For now, Syed is charged in the killings of Aftab Hussein and Muhammad Afzaal Hussain because bullet casings found at the crime scenes were linked to a gun found at his home, authorities said.

Investigators consider Syed to be the primary suspect in the deaths of Naeem Hussain and Mohammad Zaher Ahmadi but have not yet filed charges in those cases.

Police said they were about to search Syed’s Albuquerque home on Monday when they saw him drive away in a Volkswagen Jetta that investigators believe was used in at least one of the slayings.

Officers followed him to Santa Rosa, about 110 miles east of Albuquerque, where they pulled him over. Multiple firearms were recovered from his home and car, police said.

Syed’s sons were questioned and released, according to authorities.

Prosecutors expect to file murder charges in state court and are considering adding a federal case, authorities said.

Aneela Abad, general secretary at the Islamic center, said the two Muslim communities in New Mexico enjoy warm ties.

“Our Shiite community has always been there for us and we, Sunnis, have always been there for them,” she said.

Muhammad Afzaal Hussain had worked as a field organizer for Democratic Rep. Melanie Stansbury’s campaign.

“Muhammad was kind, hopeful, optimistic,” she said, describing him as a city planner “who believed in democracy and social change, and who believed that we could, in fact, build a brighter future for our communities and for our world.”

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Dazio reported from Los Angeles and Fam from Winter Park, Florida.

WASHINGTON (AP) — President Joe Biden on Tuesday signed a $280 billion bipartisan bill to boost domestic high-tech manufacturing, part of his administration’s push to boost U.S. competitiveness over China.

Flanked by scores of lawmakers, union officials, local politicians and business leaders, Biden feted the legislation, a core part of his economic agenda that will incentivize investments in the American semiconductor industry in an effort to ease U.S. reliance on overseas supply chains for critical, cutting-edge goods.

“The future of the chip industry is going to be made in America,” Biden said in a sweltering Rose Garden ceremony Tuesday, referring to the diminutive devices that power everything from smartphones to computers to automobiles. The legislation sets aside $52 billion specifically to bolster the U.S. computer chip sector.

The bill has been more than a year in the making, but finally cleared both chambers of Congress late last month with significant bipartisan margins. The Senate passed it 64-33, with 17 GOP senators supporting it, while the House quickly followed suit with a 243-187 vote that included 24 House Republicans in favor, even though party leaders began urging their ranks to vote against it after Democrats advanced a separate sweeping bill focused on climate and health care.

The White House sought Tuesday to begin selling the immediate impacts of the semiconductor measure, noting that Micron, a leading U.S. chip manufacturer, will announce a $40 billion plan to boost domestic production of memory chips, while Qualcomm and GlobalFoundries will unveil a $4.2 billion expansion of an upstate New York chip plant.

The administration has also repeatedly portrayed this legislation as a critical component in countering the influence of a rising China and ensure the U.S. can maintain a competitive edge against Beijing, particularly in semiconductor manufacturing. Administration officials have held multiple briefings for lawmakers to sketch out the national security implications of this bill, and Biden noted during his remarks Tuesday that the Chinese government had lobbied U.S. businesses against the legislation.

“The CHIPS and Science Act is going to inspire a whole new generation of Americans to answer that question: What next?” Biden said Tuesday during the signing ceremony. “Decades from now, people will look back at this week and all we passed and all we moved on, that we met the moment at this inflection point in history.”

Tuesday’s ceremony is one of several public events Biden has scheduled since recovering from COVID-19, including a visit to flood-ravaged Kentucky on Monday and another signing event on Wednesday for legislation aiding veterans who have suffered from toxic burn pits. But Biden appeared to be dealing with some residual symptoms, coughing heavily several times during his remarks and apologizing at one point for doing so.