"Shortly after Sunday's third tweet, Trump left the White House and was driven to his private golf club in Northern Virginia".
Britain was already on high alert following the attack on a concert by United States pop star Ariana Grande in Manchester, northwest England, in which seven children were among the dead.
At least 48 people were taken to hospitals, the London Ambulance Service tweeted.
The attackers, wielding blades and knives, ran down a set of stairs into Borough Market, a well-known fruit and vegetable market that's also home to popular restaurants and pubs.
Reports of the incident reflected fear that the incident could be terrorism.
He also retweeted a tweet from conservative news website Drudge Report which said that there were fears of new terror attacks ahead of the general election in the United Kingdom on June 8.
Police have arrested 12 people in connection the attacks.
In a picture he took, a man wearing combat pants, with a shaved head and what looked like a belt with canisters attached to it could be seen on the ground with two more bodies behind him.
Television footage of crowds running away from the attack that killed seven includes a man in a red top walking slowly with a mostly full beer in his hand. "Run over them by vehicles". "That's because they used knives and a truck!" Although there was no immediate claim of responsibility for the attack, May said it was tied to Islamic extremism. "But it is time to say 'enough is enough'".
He said security plans at forthcoming events were being reviewed, and cordons at London Bridge and Borough Market would remain in place for some time. But he added: "I'm reassured we are one of the safest global cities in the world".
The government's Cobra emergency committee will meet today, Downing Street said.
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Though there has been a distinct police presence following the London terror attack on Saturday evening and armed police officers have been pictured walking around the venue.
Mr Rowley, the chief of the UK's Counter Terrorism Police, said they were increasingly confident the attack was carried out by three individuals, but it needed to be establishes whether others were involved in planning.
Some Republicans this weekend echoed the president's calls in light of the recent attack in London.
How many people have to die before West wakes up to dangers of politically correct immigration/refugee policies?
Trump's travel ban - which, among other things, would temporarily block entry into the U.S. from six Muslim-majority countries - has been blocked by a number of federal court decisions.
Information on the attackers is now scant, and again, the Islamic State has not yet taken responsibility for the attacks at time of writing.
"I condemn it in the strongest possible terms". "That this should happen in this month of Ramadan, when many Muslims were praying and fasting only goes to show that these people respect neither life nor faith".
"The attackers were wearing what were later found to be fake explosive vests".
A taxi driver told the BBC that three men got out of the van with long knives and "went randomly along Borough High Street stabbing people".
There's a patient in this hospital who's been shot in the head; a man. Terrorism struck at the heart of London, police said Sunday, after a vehicle veered off the road and mowed down pedestr.