Armed police were called to Finchley Road Station on Tuesday after reports of a firearm on a train - but after searching the train in question "an imitation firearm" was found in a teenager's rucksack.
British Transport Police armed response officers searched the train in question after reports that a man with a gun had got on the Tube at Wembley Park shortly before 4pm.
A BTP spokesperson said: "British Transport Police received a report of a male in possession of a firearm at Wembley Park Underground station at 3.55pm yesterday (20 April).
"A train was stopped at Finchley Road Underground station and armed officers quickly attended and carried out a search of the service.
"An imitation firearm was located in a rucksack and five people aged 17 to 18 were taken to police custody for questioning. Enquiries are ongoing."
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