The bomb was discovered in Paris around 4 a.m. by workers doing earth-moving work near the tracks in the Seine-Saint-Denis region. Eurostar trains to and from London were brought to a halt.

A half-ton World War II-era bomb found by workers near train tracks outside of Paris is disrupting train and road travel across the region.

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.