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.

Eurostar has cancelled all trains from London until at least mid-morning after the discovery of an unexploded Second World War bomb disrupted traffic at Paris’s busy Gare du Nord station. “An unexploded bomb from the Second World War was discovered near the tracks,” French national railway company TER said.