Islamists who carried out two deadly attacks in Spain last week had collected 120 gas canisters and intended to detonate some of them at the Sagrada Familia, according to Spanish media.

The canisters were found in the coastal town of Alcanar as police searched for the driver of a van that rammed into crowds in the Las Ramblas district of Barcelona, killing 14 people.

A separate vehicle attack in the town of Cambrils left one woman dead. Five suspected jihadists were killed by police.

On Sunday Spain’s king and queen attended a Mass for victims at the Sagrada Familia, Antoni Gaudi’s still unfinished basilica.

King Felipe VI and Queen Letizia, the prime minister Mariano Rajoy, and families of the victims were among those at the Mass.

Cardinal Juan José Omella of Barcelona read out a message from Pope Francis, who called the attacks a “cruel terrorist act” and a “great offence to the Creator”.

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