A large explosion "of unknown origin" rocked a building in downtown Budapest late on Saturday, injuring two passing police officers, authorities said. The blast occurred at 10:30 pm local time (2030 GMT) inside or beside a ground floor shop on a major intersection, a police statement said Sunday.
Two police officers who were on patrol were injured and taken to hospital, said the statement.
The cause of the blast remains unconfirmed, although a news report on public television said security cameras had recorded a bag being left at the scene shortly before the explosion.