According to the BBC, police said the attack began at 9:58 p.m. when a rented van entered the north side of London Bridge, careening into the pavement and striking several people before coming to a stop at the other end of the bridge near Barroway and Banker pub.
President Donald Trump is offering his condolences to British Prime Minister Theresa May after Saturday's terror attacks in central London. Three men fled the van with large knives and attacked people at bars and restaurants in nearby Borough Market, police and witnesses said. She continued, "One of them had a big knife, then he came in and walked around the restaurant, I guess they just kind of stabbed anyone that they saw and knocked things on the ground and then we just hid". British police said 21 remained in critical condition Sunday night.
Rowley says police are confident that the three men fatally shot by officers in the minutes after the assault were the only attackers, but there is "clearly more to do" in the investigation.
In addition, three attackers were shot dead by police.
Britain was already on edge after a suicide bombing two weeks ago at an Ariana Grande concert in Manchester, in northwest England, that killed 22 people and injured dozens of others. Canadian entertainer Justin Bieber is expected to perform. He said police were increasingly confident the attack had been carried out by three individuals, but needed to establish whether others were involved in the planning.
Opposition leader Andrew Scheer said in a written statement Sunday that Canada and the United Kingdom have historically stood "shoulder to shoulder" against threats. Liberal Democrat leader Tim Farron said "the remainder of this campaign must be a collective showing of defiance and pride in our democratic values".More news: California plots to fight 'AWOL' Trump on climate
More news: United Kingdom opposition leader Corbyn: "difficult" talks needed with Saudis after London attack
More news: American States To Form "Green Wall" Against Trump's Anti-Paris Actions
Law enforcement officials in major USA cities said they were not aware of any threats but were on alert.
On Sunday morning, the day after a deadly terror attack in London, Donald Trump sent out a tweet critical of London Mayor Sadiq Khan for doing what any normal politician would do in telling people not to panic.
"Our thoughts are with all of those who died or were injured, and their loved ones as they try to come to terms with what happened", Crowther added. The president tweeted in part, "We need the Travel Ban as an extra level of safety!"
On Sunday, May made a strongly-worded - and inevitably political - statement in front of her 10 Downing St. office, arguing that "things need to change" in the fight against global terrorism.
It was the third militant attack in Britain in less than three months. "These hateful acts do not deter us; they only strengthen our resolve. We will stand together to defend our common values of solidarity, humanity and justice and will not allow terrorists to derail our democratic process", Corbyn said in a statement.
With files from Canadian Press.