But the regional Catalan government said there could be further arrests.
Police have arrested four people - three Moroccans and a citizen of Spain's North African enclave of Melilla - aged between 21 and 34.
"This is the height of the tourist season here".
Spanish media say authorities believe Younes Abouyaaqoub drove the van though Catalan police can not confirm who was at the wheel. They said some of the ones that they knew - some of the terror - terrorists were very pleasant, well-integrated, polite guys.
A huge manhunt is underway across Europe for at least one suspect still at large after plotting Spain's terrorist attacks in which 14 people were killed and hundreds were injured.
Spain is now holding three national days of mourning.
Prayer time is approaching but Raja Miah, an imam at a tiny mosque in the heart of Barcelona does not expect a big turnout.
On Thursday, 13 people were killed and more than 100 were injured when a driver in a white van mowed down pedestrians on La Rambla, a Barcelona boulevard popular with tourists and locals. So has Mohamed Aalaa, brother of Cambrils attacker Said, whose car was used in that attack.
Another photo shows tools and nails scattered around the living room.
Spain will maintain its security alert at four, one notch below the maximum level which would signal an attack was imminent, Zoido said on Saturday. Cars with European number plates belonging to families back for the summer are commonplace on the streets. "All of Spain is Barcelona".
Officers have found "the remains of two different people, we are working to prove that they are two of these three people who have been identified", said Trapero. Police were going through his apartment today. A 15h person was killed in another attack hours later in Cambrils, 70 miles south of Barcelona.
She said that on Wednesday she was flung to the floor by a violent blast.
The driver of the van that rammed into crowds on Barcelona's La Rambla, killing 13 people including an American, may have crossed the border into France, Spanish police said Sunday.
Mobile phone footage showed several bodies strewn along the Ramblas, some motionless. Paramedics and bystanders bent over them, treating them and trying to comfort those still conscious. "Maybe that's where he was brainwashed", the cousin said. Despite the close call, Grahn said he won't let the experience dampen future travel plans.
People gather around tributes laid on Las Ramblas yesterday after a minute's silence for the victims.
"We are so blessed to have had him in our lives and will remember his smiles and hold his memory dear to our hearts".
Since the twin attacks in Barcelona and the nearby seaside resort of Cambrils claimed by the Islamic State group, the Muslim community in central Barcelona's neighbourhood of Raval fears an anti-Islam backlash. The home blew up on Thursday after the authorities said an explosive device had detonated. They took care of me, booked my flight when I went on vacation.
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