A powerful explosion struck the Plaka tourist district of Athens, Greece, near the ancient Acropolis early Friday, causing a building to collapse and leaving at least two people injured, authorities said.

According to the fire department, the blast occurred inside an aging two-story structure in Plaka, the historic neighborhood located at the base of the Acropolis hill, one of Greece’s most prominent and heavily visited ancient sites. The explosion brought down the building and caused damage to nearby structures.

Firefighters rescued two women from a neighboring building following the explosion. Police said the women were taken to a hospital for treatment. Local news reports also indicated that a passer-by suffered minor injuries in the incident.

Police established a perimeter around the affected area as emergency crews searched the scene to determine whether anyone else could have been trapped beneath the debris.

Footage from the scene showed large amounts of rubble scattered across the roadway, while several parked vehicles appeared to have been damaged by debris falling from the collapsed structure.

Authorities had not immediately determined what caused the explosion. However, local media reports indicated that a possible gas leak was being investigated as a potential cause.