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Barcelona and Cambrils attacks: What we know so far

The Spanish region of Catalonia has been rattled by two terror attacks and an explosion over three days, in what authorities are treating as a trio of linked incidents.

Four people have been arrested — one in Alcanar and three in Ripoll. It is unclear how many people were involved in the attacks and how many suspects were still on the run.

Here’s what we know so far:

Friday: Cambrils

– In the early hours of Friday morning, five armed attackers drive through a crowd of people in the town of Cambrils, 75 miles southwest of Barcelona.

– One person killed and six others injured, including one police officer.

– Police engage in a shootout with the attackers and kill all five.

– The attackers were wearing fake suicide belts.

Thursday: Barcelona

– A white van plows into pedestrians at around 5 p.m. on Las Ramblas, the city’s busiest tourist promenade.

– At least 13 people are killed and more than 100 injured in the country’s deadliest attack since the 2004 Madrid bombings.

– The driver of the van flees on foot and is believed to be still at large.

– People from at least 24 countries are among the injured, according to officials. A Belgian is among the 13 people dead.

– A second van, believed to be linked to the Barcelona van, is found in Vic, a town 43 miles from Barcelona, Reuters reported.

– A driver runs over two police officers at a security checkpoint, causing them minor injuries. It is unclear whether this is terrorism-related.

– Two suspects are arrested in the towns of Ripoll and Alcanar, but neither are the driver of the Barcelona van.

– One suspect is Moroccan and another is from Spain’s North African enclave of Melilla, Reuters reported.

– ISIS claims the Barcelona attack through its media wing, but offers no evidence supporting the claim.

Wednesday: Alcanar

– Just after 11 p.m., the fire brigade is alerted to an explosion in a house in Alcanar, a city about 100 miles southwest of Barcelona.

– One person is confirmed killed and seven others are injured.

– Officials have not confirmed the cause of the explosion.

– Police say the victim killed is a Spanish national and was not on police radar.

– Officials say the house collapsed completely and caused serious damage to the façade of the house next door.

– Of the four people arrested so far, one was detained in Alcanar and the other three in Ripoll.