UPDATE: Following a standoff of about eight hours yesterday, an armed man peacefully surrendered to York Regional Police prior to midnight last night.
No shots were fired throughout the incident that began at about 4 p.m. yesterday, June 2, according to a neighbour.
Niagara Street was reopened at about midnight.
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York Regional Police have closed a portion of Niagara Street in Newmarket where an armed person is barricaded in a residence.
Police responded at about 4 p.m. Wednesday, June 2 to the area of Niagara and Simcoe Street and have set up a full command post for the investigation, according to Sgt. John McRae.
Despite the heavy police presence in the area, there is no concern for the public, McRae said.
Residents in the area remain in their homes, he added.
Niagara is closed from Davis Drive to Ontario Street, and citizens are being advised to avoid the area.
Further details will be provided when available.