The Winnipeg Police Service (WPS) say their stay on scene at a home on McGee Street may extend into the evening.
Police first advised the media a warrant was being executed at a residence in the 600 block at 12:40 p.m. Saturday.
The WPS is taking a number of precautions including the use of its Tactical Support Team and Armoured Rescue Vehicle due to the belief a firearm may be present at the home.
Officers ask everyone to avoid the area and anyone who lives in the area to listen to any direction given by officers.
Police say no injuries have been reported.