A van veered onto a sidewalk and sped down a busy pedestrian zone on Thursday in Barcelona's picturesque Las Ramblas district, swerving from side to side as it mowed down tourists and residents.
At least thirteen people were killed and 100 were injured, 15 of them seriously, in what authorities called a terror attack.
Several hours later, Josep Lluis Trapero, a senior police official, told at a news conference that two suspects had been arrested.
Trapero said one was a Spanish national from Melilla, a Spanish-run enclave in North Africa, and the other a Moroccan. Trapero said neither of them drove the van.
The arrests took place in the northern Catalan town of Ripoll and in Alcanar, the site of a gas explosion at a house on Wednesday night.
Spanish Prime Minister Marino Rajoy has said that Spain stands in solidarity with Barcelona, which had been hit by "jihadist terrorism".
Rajoy made his comments in the early hours of Friday morning after the incident took place.
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