London terror attack: Scotland Yard makes 21st arrest from Barking

The three attackers were wearing fake suicide belts consisting of plastic water bottles wrapped in gray duct tape. Anyone who saw them on the...

Commander Dean Haydon, head of Scotland Yard'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. The belts, all attached to the men at the moment when they were shot dead, looked genuine, police said. "It is this knife that police have released images of today".

Yesterday it emerged that the killers' ringleader Khuram Butt, 27, had tried to hire a much bigger 7.5-ton lorry just hours before the attack but his bank card was declined and he was forced to use the much smaller, lighter B&Q van.

Among the outlets taking part are restaurants around Borough Market, where attackers stabbed five people to death after mowing down pedestrians on London Bridge, killing three.

Police say they have interviewed 262 witnesses, from 19 countries.

Two more men were arrested by Met Police yesterday, one in Barking and one in Ilford, in connection with last Saturday's attacks.

The attackers had wound adhesive tape around the handles and in Butt's case, a leather strap had been attached to the handle and was hung around his wrist. He later found a police vehicle to get a man who had been stabbed in the stomach to a hospital. The intended truck was smaller but similar to the one used in the Nice attack a year ago that killed 86 people and injured hundreds in the resort town in the south of France. "I did see one of our customers get stabbed by one of the guys and the one who was standing beside me was shouting".

They were wearing fake gas canisters on their body, to create panic, and carried long blades.

Detectives made 21 arrests following the attack but 12 people have been released without charge.

Eight people were killed when three men ploughed into pedestrians on London Bridge before stabbing people in bars and pubs in Borough Market.

"Obviously we will be reviewing, for example, the number of armed officers we have and how they work, and a whole host of other things that are likely, from my point of view, to take more resources, and I will be asking for them".

She said: 'We know that the attackers hired a vehicle that very day.

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