Budapest: 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) Saturday in "business premises" in a basement of a building on a major intersection, police said in a statement on Sunday.
Two police officers who were on patrol were injured and taken to hospital, said the statement on the police website.
The explosion, which was heard across large parts of the Hungarian capital, blew out windows and damaged walls of the building.
Witnesses told media that the building shook from the blast and people were seen running out in panic.
The surrounding area was cordoned off and buildings evacuated.
Police said an investigation was underway to discover the cause of the blast.
Hungary's rescue agency said no fires were caused by the blast.
The renowned Liszt Academy of Music building nearby was also evacuated, according to local media.