Over a dozen people were injured when a car drove into a crowd of Espanyol supporters before the club's LaLiga match against Barcelona on Thursday.
The supporters were gathered to greet the team bus outside RCDE stadium when the incident happened just over an hour before kickoff.
Local police confirmed the driver of the car had been detained, although it remains unclear at this stage whether it was a deliberate attack or a case of them losing control of the vehicle.
"Multiple people have been injured outside Espanyol's stadium after being hit by a car," the Mossos d'Esquadra, the local police force in Barcelona, confirmed in a brief statement.