President Donald Trump said he has been briefed on the terror attack in London outside the Houses of Parliament today.

“Just getting an update on London,” Trump said, entering a meeting in the White House’s Roosevelt Room.

“Big news.”

US President Donald Trump “has been briefed on the situation” in London and is monitoring events, his press secretary Sean Spicer tweeted.

The US State Department says it is closely monitoring the incident and urged Americans in London to avoid the area.

Spokesman Mark Toner said: “We stand ready to assist in any way the UK authorities would find helpful.”

He added that the US Embassy in London is closely following the news and stands ready to help any affected Americans.

He said: “Our hearts go out to those affected.”