An unexploded WWII bomb discovered near tracks leading to France's busiest train station has severely disrupted rail service as police work to disable the device.

All domestic and international trains at Gare du Nord, Europe's busiest train station, came to a halt Friday after an unexploded World War II shell was discovered, officials said.

PARIS - Rail services resumed on March 8 at Gare du Nord station in Paris, one of the busiest rail hubs in Europe, after all trains were cancelled for much of the previous day following the discovery of a World War II bomb.