It is being reported four people have been killed and dozens more injured after a van plowed through a crowd of pedestrians and two men entered a restaurant armed with guns.
The attack occurred near Las Ramblas in Barcelona, Spain. Pictures and videos are flooding the internet of the attack. The area is a picturesque promenade in the city center and is lined with trees.
Shots could be heard at the Corte Ingles store in the area after police had announced a ‘massive crash’.
Chilling footage has shown dozens of victims lying injured on the floor.
The reports are coming out that the van ran through the crowd of people before the gunmen ran into the restaurant.
Eyewitnesses reported seeing people running away and screaming after the incident happened.
Spanish prime minister Mariano Rajoy said he is in contact with all emergency services and stressed the priority is to help the injured.
Armed police have also been seen rushing into the area while emergency services have asked to close Metro and train stations in the city.
One witness told Sky News: ‘It was quite terrifying. All of a sudden scores of people ran towards us, hysterical, children hysterical… first of all they said someone had been shot.
‘All of a sudden a second wave of people came down the street, we just ran, I lost my husband in the melee. The shops went into lockdown mode.’
She added: ‘We really had no idea what was going on other than that we needed to get ourselves out of there very quickly… there was just hundreds of people running away very quickly.’
Another said: ‘We were just told to run, it must have been quite close because… there was an immediate stampede to run away. We were just a minute away from it.’
The local police force was said to be evacuating the area including the nearby main square the Plaza de Catalunya.
El Periodico said the CIA had warned local police two months ago that La Rambla could be the scene of a terrorist attack.
‘Huge collision on Las Ramblas in Barcelona by an individual driving a van, many injuries,’ a statement from Catalan police said.
Aamer Anwar was walking down Las Ramblas at the time, which he said was ‘jam-packed’ with tourists.
He told Sky News: ‘All of a sudden, I just sort of heard a crashing noise and the whole street just started to run, screaming. I saw a woman right next to me screaming for her kids.
‘Police were very, very quickly there, police officers with guns, batons, everywhere. Then the whole street started getting pushed back.’
Anwar said the scene was ‘chaos’, everyone was in ‘panic mode’.
He added: ‘Police officers who got there just started screaming at people to move back, move back.
‘One of the shopkeepers tried to speak to him. He said he saw five or six people seriously injured on the ground, a van had driven into people.
‘And literally within probably 30 seconds, police vans, ambulances, police officers with guns, were piling out and we were being sectioned off and then being pushed rapidly back down Ramblas.’
Authorities in the area have warned people from visiting the busy tourist hotspot.
A police spokesman did not confirm whether the crash was being treated as a terrorist attack.
The incident has taken place at the height of the tourist season in Barcelona, which is one of Europe’s top travel destinations with at least 11 million visitors a year.