Police are hunting the driver of a van that drove into a crowd in Barcelona, killing at least 13 people and injuring more than 100.
The white van mounted the pavement of Las Ramblas, the main tourist area in the city, and hit dozens of people on Thursday afternoon.
Police have arrested two people over the attack – but they are still hunting for the driver of the vehicle who is said to have fled on foot.
Senior police official Josep Lluis Trapero said, although two people are being held “that doesn’t mean that either were the author of the attack”.
There is no evidence the person who left the van was armed, Catalonia’s interior ministry said.
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Police initially said they were looking for a man of 5ft 5ins (1.7m) in height, wearing a white shirt with blue stripes.
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The two people being held are a Spanish national from the country’s African enclave of Melilla and a Moroccan. They were arrested in Ripoll and Alcanar.
One of the man who has been arrested is the named suspect Driss Oukabir, a Moroccon national, who was from Marseille.
A Facebook account says lives in Ripoll, Catalonia, about 50 miles north of Barcelona.
Police identified his name as having been used to rent the van.
He reportedly handed himself in to the police station at Ripoll after he saw his photo in the media.
He claims his documentation had been stolen and that he was in Ripoll at the time of the attack.
The van used in the atrocity is said to be a Fiat, that was hired from an address in Santa Perpetua Of the Mogoda, about five miles north of the city.
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Islamic State said it was responsible for the Barcelona van attack, according to the Amaq news agency, and Spain’s Prime Minister described it as a “jihadist attack”.
Hours after the van attack in Barcelona, Catalan police said they shot and killed five suspects in response to another terrorist attack in the seaside resort town of Cambrilas.
Catalan authorities say the attacks are linked.
Meanwhile, security forces have found a second van connected to the attack in the town of Vic, 40 miles from Barcelona, 18 miles south of Ripoll, according to police sources.
And separately, a driver ran into two police officers at a checkpoint in Sant Just Desvern, about five miles west of Las Ramblas, at 7.24pm local time, but it is not known if it is linked to the attack.
Regional police troopers shot and killed the driver after the vehicle, reportedly a white Ford Focus, was intercepted by officers.