Video from the scene broadcast by Canadian network CBC showed emergency vehicles on a residential road, identified by the police as Brookside Drive. "We will provide more details as soon as we can", city police tweeted.
At least four people are reported to have died during the incident that occurred at 8.20am local time (12.20pm GMT).
"The public is asked to avoid the area and stay in their homes with doors locked at this time for their safety", Fredericton police said.More news: WF coach charged with assault in connection to death
Shooting took place in the city of Fredericton where police urging people to stay inside and lock doors.
The Fredericton resident said he heard a series of "firecracker" sounds around 7 a.m.
Police tweeted: "We are asking people to avoid the area of Brookside Drive this morning due to an ongoing incident".More news: Brad Pitt: I've given Angelina Jolie $9m since split
"With the tempo, it might've been a gunshot", he said.
About five minutes later, he could hear similar noises near his home.More news: Tottenham make history by completing no summer signings
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