Armed police descended on a street in Oldham following concerns for a man who reportedly had a machete.
Officers were called to Brooks Drive in Failsworth at around 10am on Saturday morning.
It is understood the man smashed a window at a house and cut himself on broken glass.
GMP confirmed a machete was discovered inside the property and was seized by officers.
A spokesman for the force said the man - whose age has not been released - was suffering from a 'medical episode' and there was no wider risk to the public.
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He was taken to hospital after being treated by 'trauma trained officers'.
No one else is believed to have been injured.
The force said in a statement: "Police were called to an address on Brooks Drive in Failsworth at around 10am this morning (Saturday 21 September).
"A man was found to be suffering from a medical episode and trauma trained officers provided medical treatment to the man.
"The man had sustained injuries from a broken window and he was taken to hospital where he is being treated for his injuries."
