The incident happened in Fredericton, the capital of the Canadian province of New Brunswick, with police saying they now have one suspect in custody. Wait for updates from police, ' the Fredericton Fire Department said on Twitter.
They have advised residents of Brookside Drive to "stay in their homes with doors locked at this time for their safety".
Fredericton is located about 50 miles northeast of the USA border with Maine.
Police are asking people to avoid the area of Brookside Drive between main and Ring Road.More news: Mourinho Expects "No" Players To Sign For Manchester United Today
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He heard similar sounds about five minutes later, near his home, he said.
They also asked people in the area to stay inside and to lock their doors.
A worker at a nearby Tim Horton's coffee and doughnut shop revealed staff had locked the doors and are keping customrs insid. But a proliferation of weapons has led to an increase in gun crimes in recent years.