Tube passengers in Hammersmith faced delays this morning after being warned over the tannoy that an unexploded Second World War bomb had been found under the tracks.

Police closed off roads either side of the railway arches under the elevated Hammersmith and City and Circle Line track, between Hammersmith and Goldhawk Road stations, after the suspected bomb was discovered near Trussley Road at around 9am.

It turned out to be a false alarm, and the operation was stood down after 20 minutes.

Passengers used social networking service Twitter to relay messages from the Tube driver.

Gavinio1 said: "Our driver just told us of an unexploded bomb on the Hammersmith and City train line! Puts us on this train at ease."

The incident is continuing to cause minor delays on Tube lines serving Hammersmith and Shepherd's Bush.