Butane and propane gas canisters were found at the scene

But the charges they were sentenced over relate to an accidental explosion at a house in the small town of Alcanar, which is 200km (124 miles) south of Barcelona, that happened the day before the attacks began.

Explosives and gas canisters were stored in the building, and Chemlal later told investigators the cell had been planning attacks "on an even greater scale".

The material they were planning to use was destroyed in the blast, police said. The explosion also killed the group's leader, a 44-year-old imam.

What happened in 2017? slot pg
On 17 August 2017, a rented white van was driven down Barcelona's busy Las Ramblas avenue at high speed. It careered into pedestrians along the packed street which sits at the heart of the city's tourist area.

Fourteen people were killed and more than 100 were injured. The victims included people from Australia, Germany, Italy, Portugal and the US.
After driving the van, 22-year-old Abouyaaqoub, then abandoned the vehicle and fled the scene on foot. He later hijacked a car and killed the driver.

The following day, five members of the jihadist cell drove to Cambrils which is 100km (62 miles) down the coast from Barcelona.

The launched a knife attack on the promenade and one woman was killed. All five men were shot dead by police.

Abouyaaqoub was also killed by police on 21 August after spending several days on the run.