Police in the far eastern Canadian city of Fredericton lost two of their own in a shooting incident on Friday morning. Fredericton police confirmed in a tweet that there were "at least four people killed" earlier in the day, and later said two of the dead were officers.

The police said they had one suspect in custody but advised residents that the area would remain "contained for the foreseeable future" amid the ongoing investigation. About three hours after first indicating an ongoing incident in Fredericton, the police appeared to have the situation under control, saying in a tweet that there was "no further threat to the public, and lockdowns are not required at this time."

Fredericton is in New Brunswick province, about 50 miles northeast of the U.S. border with Maine.

The police said the suspect in custody sustained "serious injuries related to this morning's shooting incident." They did not provide further detail on the individual's condition or the nature of his or her injuries.

Residents were warned to "stay in their homes with doors locked at this time for their safety" in an earlier tweet by police. Video from the scene broadcast by Canadian network CBC showed emergency vehicles on Brookside Drive, a residential road.

(CBS News)