Police were seen removing a 'large meat cleaver' after armed officers swooped on a house in south Manchester.
There was a large police presence following the incident on Sale Road in Northern Moor, Wythenshawe.
Witnesses described how police cars were 'shooting up and down' Sale Road at about 4pm on Sunday.
Armed officers then entered a terraced house close to Wythenshawe Park.
One neighbour said: "There were police cars shooting up and down the road, then two cars parked up outside and they went into a house across the street.
"We went for a walk and there were some police up the road as well."
One witness described how he saw police removing what appeared to be a large 'meat cleaver' in a clear plastic bag.
Pictures from the scene show around half a dozen police vehicles lined up along Sale Road while armed police were pictured gathered on the pavement.
Police were also seen searching an area a little further along Sale Road and around nearby Yewtree Lane.
The Manchester Evening News has attempted to contact GMP for further comment.