Local reports in Barcelona suggest a van has crashed into three policeman, close by the scene of the attack this afternoon.
It is reported that the attack took place at a police control point on Diagonal, the busy street which runs perpendicular to Las Ramblas, where several people were hit by a van earlier today.
Latest reports suggest that a van escaped the police control and ran into the agents. It is also claimed that a policeman was fired on during the ensuing exchange.
Spanish newspaper El Mundo says 'it isn't known whether this was linked to the earlier attack.'
Earlier today a van was used to plough into tourists on Las Ramblas, Barcelona's central tourist destination which attracts thousands of visitors every day.
Witnesses reported that the street was packed with people as the van scaled a pavement and crashed into passers-by. The head of the Mossos d'Esquadra, Barcelona's local police force, says 13 people have died and 50 more are injured.
The police are claiming a terrorist has died, but it is not known what role they played in the attack.
Another of the suspects, named as Driss Oukabir, has been arrested. It is reported that the van used in the Ramblas attack was leased in the name of Oukabir, who is of Moroccan origin, however it is not known whether he was the person driving the van.
It was earlier reported that the man who was driving the van managed to escape, and subsequently holed himself up in a bar with hostages. However this has been repudiated by the Mossos d'Esquadra, Catalunya's local police force.
A second van linked to the attack has been located in Vic, a neighbourhood near Barcelona.
Police say they are treating the incident as a terrorist attack and several nearby landmarks, notably Placa Catalunya and the popular Boqueria market, have been closed.