Police also said when they searched a bedsite flat rented by Redouane, they found an English-language copy of the Koran opened at a page describing martyrdom. They also found water bottles spelling of petrol.

Detectives believe the bedsit was the attackers' safe house where the three men planned and prepared the London Bridge attack.

Police also revealed Butt had attempted to hire a 7.5-tonne lorry online, but failed to provide payment details. They say if the terrorists had hired such a heavy vehicle the death and injury toll could have been much higher.

A number of people are still in police custody after being arrested on suspicion of terror-related offences, with detectives saying they expect to make more arrests and search further addresses in the coming days as their fast-moving investigation continues.

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