The Latest: Trump says Iran proposed negotiations as hundreds killed in protests

U.S. President Donald Trump says Iran has proposed negotiations after his threat to strike the Islamic Republic as an ongoing crackdown on demonstrators has led to hundreds of deaths.

Trump said late Sunday that his administration was in talks to set up a meeting with Tehran, but cautioned that he may have to act first as reports mount of increasing deaths and the government continues to arrest protesters.

"The meeting is being set up, but we may have to act because of what's happening before the meeting. But a meeting is being set up. Iran called, they want to negotiate," Trump told reporters on Air Force One on Sunday night.

Iran did not acknowledge Trump's comments immediately. It has previously warned the U.S. military and Israel would be "legitimate targets" if America uses force to protect demonstrators.

The U.S.-based Human Rights Activists News Agency, which has accurately reported on past unrest in Iran, gave the death toll. It relies on supporters in Iran crosschecking information. It said at least 544 people have been killed so far, including 496 protesters and 48 people from the security forces. It said more than 10,600 people also have been detained over the two weeks of protests.

With the internet down in Iran and phone lines cut off, gauging the demonstrations from abroad has grown more difficult. Iran's government has not offered overall casualty figures.

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Iran has summoned the British ambassador over protesters twice taking down the Iranian flag at their embassy in London.

Iranian state television also said Monday that it complained about "certain terrorist organization that, under the guise of media, spread lies and promote violence and terrorism." The United Kingdom is home to offices of the BBC's Persian service and Iran International, both which long have been targeted by Iran.

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Associated Press writer Jon Gambrell in Dubai, United Arab Emirates, contributed.

A huge crowd of demonstrators, some waving the flag of Iran, gathered Sunday afternoon along Veteran Avenue in LA's Westwood neighborhood to protest against the Iranian government. Police eventually issued a dispersal order, and by early evening only about a hundred protesters were still in the area, ABC7 reported.

Los Angeles is home to the largest Iranian community outside of Iran.

Los Angeles police responded Sunday after somebody drove a U-Haul box truck down a street crowded with the the demonstrators, causing protesters to scramble out of the way and then run after the speeding vehicle to try to attack the driver. A police statement said one person was hit by the truck but nobody was seriously hurt.

The driver, a man who was not identified, was detained "pending further investigation," police said in a statement Sunday evening.