MOSCOW?- The roof of a bank's office building collapsed Wednesday morning in the north of Moscow, inflicting no casualties, police said.

Emergency workers evacuated all staff and visitors from the four-story building after the roof caved in on an area of 100 square meters, Interfax news agency cited authorities as saying.

Rescuers with sniffer dogs and firefighters working on the site ruled out the possibility anyone had been trapped in the debris.

Investigation is underway to determine the cause of the incident.