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.

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.

The police successfully defused the explosive device, which weighs more than 1,000 pounds and was found near tracks north of the French capital during landscaping work.