A white van ploughed into a crowd of people in Las Ramblas area of Barcelona, in what authorities are treating as a terror attack.

The El Pais newspaper reported at least 10 people have died while Cadena Ser radio station reported 13 people were killed in the attack. Police have not yet confirmed the number of casualties.

Authorities said the vehicle mounted a pavement and struck people in a “massive crash” in an area of the city that is popular with tourists.

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An eyewitness told a Spanish television station that the suspect was running people over in his van for nearly 1,000 feet before fleeing into a nearby Turkish restaurant.

The witness said the suspect had something in his hand but he could not tell what it was. Police sources told ABC News there is also an ongoing hostage situation at a nearby restaurant.