If ISIS was behind Friday's bombing of the London metro, it would be the group's fourth attack in the U.K. this year.
"I never think it's helpful for anyone to speculate," Prime Minister Theresa May said.
The president was quick to condemn the attack on a London subway train.
Passengers post images of a bucket as the suspected cause of the blast after a reported fireball in west London.
There were chaotic scenes Friday as residents were evacuated from London blocks which failed safety tests conducted to avoid a repeat of the deadly Grenfell blaze.
Animals need some ice-cold loving too.
The Department of Homeland Security and the FBI had warned about vehicle-ramming attacks, but this method is usually associated with Islamist extremists and jihadis.
Monday’s attack targeted worshippers from an institution with a proud history of fighting violent extremism.
“This is what they want. This is what they are aiming for."
Police said the figure could change. Police had previously put the death toll at 30.
Fire departments in the United States and United Kingdom are increasingly using unmanned aircraft.
Police have confirmed 17 died in the blaze, but say the number will rise. Locals who knew people inside struggle to comprehend how this happened in one of London's richest areas.
London Fire Commissioner Dany Cotton described the blaze in a statement as an 'unprecedented incident.'
Sadiq Khan has called on the British government to cancel Trump's visit later this year.
Trump tweeted: "At least 7 dead and 48 wounded in terror attack and Mayor of London says there is 'no reason to be alarmed!'"
Revellers shouted and threw barstools at the three attackers, who killed seven and injured 49.
On social media, people reported being told to go into bars and restaurants and and take cover under tables.
The aim is to bring regular season games across the Atlantic in 2019.
A tweet from the embassy comes days after a report that suggested Rich was a WikiLeaks informant, which has since been refuted.
Outstanding performances give life to the strikingly sparse re-staging of Tony Kushner's epic two-parter.