A woman was also arrested during the raid but later released, according to the broadcaster.
"The Mayor is busy working with the police, emergency services, and the government to coordinate the response to this horrific and cowardly terrorist attack and provide leadership and reassurance to Londoners and visitors to our city", the statement said.
A woman hands a bouquet of flowers to be left in the London Bridge area of London, Sunday, June 4, 2017. Armed officers confronted three suspects, who police said were wearing "hoax" suicide vests, at the market.
London authorities were investigating reports that a vehicle had hit pedestrians on London Bridge. The white van then continued to drive to Borough Market.
There were also reports of a third stabbing, in the Vauxhall area of London, but police determined it was not connected to the terror incidents at London Bridge and Borough Market.
Chilling footage taken from a cab driver's dashcam shows people fleeing in the aftermath of the terror attack on London Bridge. She said the recent attacks are not directly linked, but "terrorism breeds terrorism".
He told the Press Association: "He's lived here for about three years".
Residents reported hearing loud bangs and said they were later told by police they were controlled explosions.
Trump ended with: "Do you notice we are not having a gun debate right now?"
Ms Dick said authorities are already at a "very high level of alertness". Several days later it was lowered to "severe", meaning an attack is highly likely.
"So, we were prepared potentially for an incident as we have been for some considerable time".
"But when it comes to taking on extremism and terrorism, things need to change".
"In my view, we responded extremely well.to this ghastly, ghastly incident". We don't believe there is, but we must make absolutely certain of that.
Sunday morning, police are continuing to comb through the area for clues.
Large numbers of officers are at the scene as a thorough search is conducted to ensure "everyone has been accounted for". "We will come together and, united, we will take on our enemies, she says". Police specialists collected evidence in the heart of London after a series of attacks described as terrorism k.
He said: "Although he is seriously unwell, he was able to recount how he faced the attackers armed only with his baton, outside London Bridge station".
Three men rammed a van through crowds of pedestrians on London Bridge on Saturday, before attacking revellers with knives, leaving seven people dead and 48 in hospital. Five people died in that attack.
"One of them had a big knife". Then came the May 22 Manchester concert bombing.
The man with the knife stabbed a waitress, who was hiding behind a partition, in the neck and stabbed a man in the back before running out of the restaurant, the witness said.