After at least two separate suspected terror attacks in London, President Trump said on Twitter that the United Kingdom will have America's full support.

"Whatever the United States can do to help out in London and the U.K., we will be there," Trump said.

"We are with you God Bless," Trump continued.

As FoxNews.com initially reported

As many as three different incidents, one described as terror-related, were unfolding in London late Saturday, including a van crashing into a crowd at London Bridge and a series of stabbings reported at nearby Borough Market.

Police also urged people to stay away from the Vauxhall area -- more than a mile away -- as they looked into another "incident," without elaborating. Gunfire erupted at the bridge, though witnesses said it could have come from police.

Sources told Sky News the London Bridge crash was being investigated as a "terrorist incident." It came just over two months after a deadly car-and-knife attack at British Parliament, and less than two weeks after the suicide bombing at the Ariana Grande concert in Manchester that killed 22 people. Britain just recently lowered its official terror threat from "critical."

Witness Holly Jones told the BBC a white van careened off the road and struck as many as six people on London Bridge. She said she saw at least four or five people on the ground.

Trump also repeated his call for domestic vigilance in the face of terror attacks.

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He said that the federal courts must allow him to exercise his executive powers relating to vetting immigrants from terrorist hotbeds.

Watch reaction from a witness above, and follow Fox News for the latest updates on air and online.