One of the five terrorists killed by police during the terror attack in Cambrils may have been the driver of the van which left 13 people dead in Barcelona, local police have said.

Four of the dead men have been identified. They were aged 21, 27, 28 and 34. Three were Moroccan and one was Spanish, and police said none of them were previously known to the security services for terror-related reasons.

But Catalan regional police official Josep Lluis Trapero told reporters the fifth man had not yet been identified.

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He also revealed that police had yet to identify the Barcelona driver and said: “It could be one of the people shot in Cambrils, but we don’t know yet.”

A woman injured in Friday’s attack in the Catalan coastal town later died, bringing the body count from the twin attacks to 14, plus 130 injured.

Prime Minister Theresa May said a child with dual British nationality was believed to be among those unaccounted for.

Mr Trapero said an explosion at a house in the town of Alcanar on Wednesday had meant the attacks were more “rudimentary” than planned.

“We are working on the hypothesis that these attacks were being prepared for a while around this private home in Alcanar,” he said.

“We think they were preparing at least one or more attacks in Barcelona.

Locates terror attacks in Spain.(PA graphic)

“The explosion in Alcanar at least avoided some of the material they were counting on to carry out even bigger attacks than the ones that happened.

“Because of that the attack in Barcelona and the one in Cambrils were carried out in a bit more rudimentary way than the one they had initially planned.”

An armed policeman on patrol in Cambrils, SpainAn armed policeman on patrol in Cambrils (Emilio Morenatti/AP)

Britons caught up in both incidents spoke of the terror and carnage they witnessed in attacks with many similarities.

Fitzroy Davies, from Wolverhampton, said it was like watching a “horror film” as panic engulfed the busy street.

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Mr Davies, who was in town for a judo camp, described seeing a crazed attacker behaving “like somebody who was on drugs”, before being shot.

He told Sky News: “He then fell down and then within two seconds he stood back up.

“He then stepped over the fence, charged the police again and the police then gave some more shots and then he fell down again.”

More than 100 people were injured in the Barcelona massacre, the deadliest attack in Spain since the 2004 Madrid train bombs in which more than 190 people were killed.

There were also reports that investigators believe the terror cell may have been planning an attack using gas canisters.

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Two suspects, a Spanish national from Melilla and a Moroccan, were taken into custody in the wake of the attack.

A third was arrested later.