No details have been released about the casualties, but a Canadian citizen was among those killed, the country's Prime Minister Justin Trudeau said in a statement on Sunday.
"We are all saddened by this senseless tragedy, especially since it happened on home ground, and we want to help the people affected, where possible", she said. She had room in her heart for everyone and believed strongly that every person was to be valued and respected.
Four police were among the dozens of people injured by the three terrorists, who killed seven people.
"I thought he was going to get shot - the police officer had his gun on him and was ready to shoot".
Tales of heroism emerged in the aftermath, with one British Transport Police officer taking on the trio armed only with his baton before being stabbed in the head, face and leg. A French national was also confirmed dead.
England's health authority said yesterday afternoon that 36 of those injured remained in hospital, of whom 21 were in a critical condition.
London's Metropolitan Police arrested 12 people in the Barking district of east London in connection with the attack and raids were continuing there, the force said.
Conservative politician Penny Mordaunt tweeted the transcript of Khan's interview and said: "I'm standing with resilient London and him".
The government will review anti-terror laws to give police more powers and stiffen punishment for terror-related offences, step up efforts to prevent radicalisation, and cooperate with other governments to get Internet companies to stem the spread of extremist ideas.
Two suspects were also detained in East Ham.
Police say three men drove a van over London Bridge just before 10 p.m. Saturday and struck pedestrians before crashing the vehicle outside a pub.
"It is time to say 'Enough is enough, '" May said.
The attacks left seven dead and 48 injured.
Jack Applebee, a local restaurant owner, said people were running down the street and he heard a female shout, "They're stabbing everyone".
The university's worldwide risk management partner, global SOS, has advised students to avoid traveling to the London Bridge and Borough Market areas, where the attacks occurred.
Witness Mark Roberts said he saw a van speeding across the bridge and then suddenly swerve, bounce off the pavement and hit several pedestrians.
The issue of inter-agency cooperation had made headlines last month when British Prime Minister Theresa May complained to Trump about leaking of intelligence to USA press about the Manchester bombing that killed 22 people at a pop concert.
The London attacks bring out the best in Britain and in Western leaders on the European continent; it brings out the worst in Trump and his followers.