Armed cops stormed a tram stop in Tameside following reports of a man with a gun.
Police were called to the Metrolink stop on Edge Lane in Droylsden at around 2.25pm on Tuesday.
Officers searched the area and arrested a man, 21, in Ashton town centre on suspicion of possession of prohibited weapon.
He is understood to have been carrying CS gas.
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A GMP spokesman said: "Police were called to the Metrolink Stop on Edge Lane, Droylsden at around 2.25pm on Tuesday 30 April 2019, to reports that a man was possibly in possession of a gun.
"Officers attended and after a search of the area, arrested a man aged 21 in Ashton town centre on suspicion of possession of prohibited weapon.
"He remains in police custody for questioning."
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