The police asked people to lock their doors and avoid the area, confirming there had been 'multiple fatalities'.
Police in Fredericton, New Brunswick responded to the shooting in a residential neighborhood at around 7am on Friday, taking one suspect into custody after an intensive emergency response. "Please avoid the area", Fredericton Police said in a tweet.
It happened in the Brookside Drive area where there are a number of shops and houses.
Fredericton is located about 50 miles northeast of the USA border with Maine.
David MacCoubrey said he awoke in his apartment on Brookside Drive around 7:07 a.m. today to the sound of gunshots "10 metres from my bed". 'It was sort of like a pop, pop, pop, pop'.
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"Doors are locked and everybody's inside", he said.
He heard similar sounds about five minutes later, near his home, he said.
Halifax Regional Police Chief Jean-Michel Blais says he has spoken to Fredericton Police Force's chief to offer any support they need.
Officers have shut down a road and are asking residents to stay inside and away from their windows because the incident is ongoing. But a proliferation of weapons has led to an increase in gun crimes in recent years.