Attackers plowed a van into pedestrians in a tourist-heavy section of Barcelona, killing at least two Thursday afternoon in what police are calling a terror attack, according to reports.

Two armed men then entered a nearby restaurant, according to Reuters. Authorities said the white van mounted the sidewalk and ran into crowds in the Las Ramblas district, Reuters reports.

The perpetrators are now holed up in a bar, police sources told El Pais.

Footage shows police moving in formation from door to door looking for those responsible, Sky News reports