A few people were certain there was more than one man, before it was confirmed there were three attackers.
The 18-year Met Police veteran said he went into autopilot while responding to the attacks but the magnitude of the tragedy hit him the following morning.
Detectives have been give more time to question a man arrested in connection with the attack.
Instead he resorted to "plan B" and rented a white van which ploughed into pedestrians as the perpetrators launched their rampage last Saturday night, killing eight and injuring dozens more.
These pink ceramic knives were covered with adhesive tape and had a leather strap, which attracted special attention by the police, who appeal for anyone with more information about them to come forward.
"I am quite confident that we will be reviewing our resources and I am expecting to have conversations with colleagues across the police service about what we think we need to face this changing and emerging threat".
"It's a disgusting thing to have happened but it isn't the kind of thing that would break somewhere like London".
Butt, 27, and his two accomplices, Rachid Redouane, 30, who claimed to be Moroccan-Libyan, and Youssef Zaghba, a 22-year-old Italian national of Moroccan descent, all died in the attack. Police determined the three extremists made themselves look like they had explosive devices wired to them to ensure they would be killed.
The measures were announced as the summer music season gets into full swing. The men got out of the vehicle and began stabbing multiple people on the bridge and at Borough Market, near the legendary London Bridge. Eight people died and almost 50 were wounded.
Nick Cron, 24, who lives in Tooting and is originally from Southampton, was also enjoying his night out along the River Thames.
Witnesses reported a man with a knife ran into the cafe and stabbed a waitress in her neck, who was behind a partisan.
They stabbed five people who had been enjoying the area's pubs and restaurants.
They believe one of the properties they searched in the east London borough of Barking was the attackers' safe house, where they prepared the attack.
Although news of her son's death came as a shock, she said she could only share the pain of the victims' families.
The London Bridge terrorists were caught on camera conspiring outside a gym just five days before they carried out the atrocity.
Q. Can we expect more such attacks and how is it possible to defend against such crude attacks?
Mr Cole said that messages of support from the public "have been fantastic" and said the response from the London community "has been absolutely phenomenal". "I want to say sorry to the families that lost their loved ones".
'We don't know - I can only surmise'.
"At any one time we have a large number of highly trained specialist firearms officers who are very mobile and strategically placed".
The footage believed to be from a surveillance camera emerged on social media. Five people died of stab wounds, and nearly 50 people were wounded in the attack. Then the terrorists reached the Borough Market, got out of the van and started attacking passers-by with knives.
During the confrontation, passers-by can be seen throwing objects at the attackers before the last victim is shown stumbling away. An undated handout photo issued by the Metropolitan Police, London, and made available Saturday, June 10, 2017, of one of the knives used in the London Bridge attacks of Saturday June 3 which killed several people a.