London police say officers are continuing an ongoing weapons investigation.
Police say around 10:40 a.m. Sunday, they received a call about a man who may have had a firearm outside a residence in the 100-block of Adelaide Street North.
No person or weapon was located after a search of the residence, police say.
Residents were evacuated from the area.
There are no reported injuries.
As of 2:15 p.m. Sunday, Adelaide Street has reopened in all directions.
Anyone with information is asked to call the London Police Service at 519-661-5670 or Crime Stoppers at 1-800-222-TIPS (8477).