Police took a 49-year-old man into custody, but haven't laid any charges yet.
On Saturday, the Winnipeg Police Service's bomb unit was sent out to a property on Washington Avenue on Saturday following reports of a suspicious package. Police located the package, which contained "unknown material."
At about 10:40 p.m., the police bomb unit detonated the device, which caused significant damage to the building, but no one was injured.
Police confirmed the bombing on River Avenue and the explosion on Washington Avenue were connected.
On Sunday, the bomb unit was deployed to C-Tech Automotive Used Car Sales and EuroTech Auto Body, both of which were taped-off, in the 2200 block of Springfield Road. Police have evacuated buildings in the area as a precaution.
Several police cruisers were also parked outside the Orle Bargen Davidson LLP office at 280 Stradbrook Ave. on Sunday afternoon.
Police have maintained throughout the investigation that the bombing was an isolated incident that does not pose a threat to the general public.