London attackers planned to use lorry

"Where might the attackers have bought them from?" he asked through a news release that included photos of one of the knives used by the terrorists. Tape was wrapped around the handles.

Haydon went on to say that "it's feasible when you look at their actions, they were still fairly close to the van, there is a possibility they could have come back to the van".

Police Commander Dean Haydon said the attackers may have worn the belts because they planned to take hostages, "or it might be that they saw it as protection from being shot themselves".

Other items were recovered from the scene of the attack. This could have been for a third wave of the attack.

British police and security services were criticised after it emerged that they had known about Butt, who featured in a TV documentary entitled "Jihadis Next Door", in which he joined a group unfurling an Islamic State (IS) flag in a park. A number of office chairs and a suitcase were found, which the terrorists said they were moving on the day of the atrocity.

Trucks have been used in a string of terror attacks in Europe over the past year.

Khuram Shazad Butt, Rachid Redouane and Youssef Zaghba have been named as the attackers, who were all shot dead.

Officers searching the house found an English-language copy of the Koran "opened at a page describing martyrdom", as well as bottles "smelling of petrol" and "a bottle of lighter fluid".

June 3, evening: Butt hires a white Renault van, using a recently-activated mobile phone.

At about 1730 GMT, the men drove to pick up the van before heading to Zaghba's home in east London. Once at the north end, it does a U-turn and heads back southwards down the bridge, hitting pedestrians.

Each of the men carried an identical blade as they inflicted the outrage on Borough Market.

Investigators have spoken to 262 people from 19 different countries in connection with the probe, 78 of whom are "significant" witnesses.

Only five remain in custody after 13 were released without charge.

A 28-year-old man was held on suspicion of terror offences following a raid in east London, Scotland Yard said.

Anyone with information can call the police in confidence on 0800 789 321 or visit gov.uk/ACT and complete a secure form.

  • Zachary Reyes