Police raced to a hospital after reports of a man with a gun on New Year's Eve.
Officers were called to North Manchester General Hospital on Friday afternoon, after receiving information that a man had been seen with a 'potential firearm'.
When police arrived they could not find the man.
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No arrests have been made and an investigation is ongoing, GMP said.
A spokesperson said: "Police were called shortly before 3pm on Friday 31 December 2021 to reports of a male with a potential firearm at North Manchester General Hospital, Delaunays Road, Manchester.
"Officers attended; however, the male had fled the scene prior to police arrival.
"Enquiries are ongoing and no arrests have been made."