Spanish police have identified the man they believe responsible for the horrifying terror attack in Barcelona yesterday afternoon.

The man accused of driving a van into pedestrians on one of Barcelona’s most popular boulevards, killing at least 13 and injuring more than 100, has been revealed as Moussa Oukabir, believed to be either 17 or 18 years old.

Police suspect that Moussa fled the scene by road and is still on the run.

Broadcaster RTVE published this image of Moussa:

Moussa is the younger brother of Driss Oukabir, who was originally named as the suspect. He was arrested in Ripoll, north of Barcelona, earlier today on suspicion of hiring the van used in the attack.

Driss has denied any involvement, reportedly telling police that his identity docs were stolen and used by someone else to obtain the vehicle.

Catalan police have arrested a second, yet-to-be-identified man in relation to the incident.

Five terror suspects in Cambrils, a coastal town south of Barcelona, believed to be about to execute a second vehicle-based attack, were also shot and killed by police overnight.

The first victim of the tragedy has been named, 35-year-old Bruno Gulotta, an Italian father on holiday with his family in the city.

Earlier today, Foreign Minister Julie Bishop confirmed that four Australians were injured in the attack, and that one remained unaccounted for.

A seven-year-old boy, Julian Cadman, has been reported missing, after he was separated from his family.

Source: The Guardian
Image: Getty Images / Anadolu Agency