Frankfurt (dpa) – Bomb disposal experts exploded a World War II bomb in the Main river in the centre of Frankfurt on Sunday, causing a water fountain several metres high. Parts of the city centre were evacuated Sunday morning as experts attempted to deal with the 250-kilogram US Air Force bomb. It was initially unclear whether it would be detonated or defused. The device was found on Tuesday during an exercise dive by the fire service. About 600 people were asked to leave their homes from 8 am (0600 GMT) on Sunday morning for security reasons, a police spokesman said. Parts of the old town around Frankfurt Cathedral were affected, as well as the opposite bank of the Main. After the evacuation, divers were deployed to examine the explosive device in the Main. Following the detonation, authorities checked the device again to ensure it was safe.