Commander Dean Haydon, head of the Met's Counter Terrorism Command, said, "We've been working round the clock to understand what these men did in the lead-up to the attack, but we need to know more about these unusual knives". Officers also discovered a Koran in their safe house, opened at a page on martyrdom.
Although Islamic State militants have claimed responsibility for the attack, Haydon said there was no evidence the attackers - Pakistani-born Briton Khuram Butt, Italian Youssef Zaghba and Rachid Redouane who had links to Libya, Morocco and Ireland - were directed by anyone else, either in Britain or overseas.
"We won't let them win and London will carry on", she said, adding that security services had foiled five plots since then.
It was not clear why he could not pay, or if he lacked the necessary licence to drive such a vehicle. If I charged at them, maybe I could take out one or two.
A total of eight people were killed on 3 June when three attackers drove into pedestrians on the bridge and stabbed people in nearby Borough Market. "The kitchen knives, each measuring 12 inches, are branded Ernesto and are ceramic, rather than metal".More news: Attorney General Jeff Sessions Offers To Testify To Intelligence Panel
The Metropolitan Police released photographs of the blood-splattered belts, which were made from plastic water bottles wrapped in duct tape.
The police had arrested 20 people from the scene that night.
Detectives have made 21 arrests as part of the probe.
"They were still fairly close to the van".
Shocking pictures emerged over the weekend of one of the knives used by the terror cell, and the fake suicide vests they tide to themselves to spread further panic.More news: Europe Reacts to General Election Results: 'Theresa May Is No Margaret Thatcher'
Police said late Sunday night that a 19-year-old man had been arrested in the east London neighborhood of Barking. Where might the attackers have bought them from?
"It could be that they had plans to take the attack into a siege situation or it might be that they saw it as protection from being shot themselves", the officer said.
It was the third terror attack in Britain in as many months, and was claimed by the Islamic State group.
"We will be looking at intelligence and our processes, and asking ourselves the question: 'Could we have prevented such an attack?'", Haydon said.More news: Netanyahu: Israel Must Keep Military Control of Jordan Valley
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