The runway of Schiphol Airport in Amsterdam has been closed due to the discovery of an unexploded WWII bomb during excavations on Monday.

The 500-pound British bomb has been unearthed in the nearby town of Vijfhuizen which forced the closure of one of the five runways of the airport.

The bomb should be left unmoved for 54 hours as it was moved by workers during excavation, experts say.

The bomb is expected to be removed Thursday.