The exact circumstances of the shooting remain unclear.
While still investigating, cops have reinforced that people need to stay away from the Brookside Drive area.
Police said there is "no further threat to the public" and an investigation is under way.
"With the tempo, it might've been a gunshot", he told CBC. When she was hired, police told reporters how excited they were to have her on patrol because she was from the area.
New Brunswick had three homicide shootings in the entire year of 2016, according to Statistics Canada.
He heard more similar noises about five minutes later.
Fredericton is the capital of the province of New Brunswick, and is home to just under 60,000 people.
Prime Minister Justin Trudeau on Twitter said his "Heart goes out to everyone affected by this morning's shooting".
In 2014, another mass shooting in New Brunswick led to the deaths of three Royal Canadian Mounted Police officers and the wounding of two more in Moncton. "We're following the situation closely".More news: Saudi suspends flights to Canada ahead of Hajj
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Travis Hrubeniuk, 27, said his fiancee had just left for work around 7:45 when he began hearing a steady stream of sirens.
At that point, police said, the two police officers were shot.
Speaking to Global News, another resident, Dave MacCoubrey, said that he could have heard as many as 17 shots coming about 30 feet from his bed.
Police have not released the names of the two Fredericton officers and two other victims who were killed.
Fredericton Police officer Sara Burns.
A resident at the apartment complex in Canada where four people were killed in a shooting on Friday says that he saw the incident unfold.
By Friday afternoon, a memorial of flowers and messages was growing in front of the Fredericton police station.
He was killed after an exchange of fire with police, who say they have yet to establish a motive.