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Police are searching for a gunman who fired shots at train carriages on one of the country's busiest rail links, forcing the suspension of all services.
A spokesman for Warwickshire Police said that movement was halted on the railway line, one of the main routes between Birmingham and London, to ensure public safety.
Speaking at about 10.15pm, he said: "It was announced over the tannoy that a gunman had been taking pot shots at trains, which meant our journey was going to be severely delayed. It is not clear when we will be able to move again."
"The first one said that someone was firing at a police helicopter with a rifle and about 20 minutes ago the guard said the whole station, including the tracks, have been declared a crime scene and we can't move until that changes.
He would not comment on whether officers were in negotiations at the scene but described the police operation as "ongoing".
Armed officers, a police helicopter and dogs were at an industrial area in Rugby, Warwickshire, searching for a person suspected of possible firearms offences.
Armed officers swoop after gunshots in Rugby
Trains services on the West Coast mainline have resumed after being suspended while armed police searched for a suspected gunman in Warwickshire.
"The comprehensive search of the area continued until after 11pm but no offender was located," the spokesman added.