The RCMP says that a man accused of a "horrific and tragic crime that took the lives of a mother and her two small children" was last spotted in Winnipeg's Skywalk and the Millennium Library.

Trevis McLeod, 50, is wanted on three counts of 2nd Degree Murder as well as Arson. The bodies of a woman and two children were discovered in a Portage la Prairie home following a fire on the weekend. The RCMP confirms that the victims were members of his family, including his 3-year-old son and 6-year-old daughter as well as his 32-year-old wife.

"The Manitoba RCMP and the Winnipeg Police Service have deployed a number of resources, including specialized units, to locate and safely arrest Trevis," the RCMP says in a release.

Police say that multiple sightings have confirmed his presence in Winnipeg, though they also warn he may return to Portage la Prairie. He was seen on Monday, April 11 on Magnus Ave. in the city's North End; in the early morning hours of Tuesday, April 12 in the St. Boniface area; and at 2:20 p.m. Tuesday at the Millennium Library and shortly thereafter, walked through the downtown skywalk.

A man wearing dark clothes walks through the SkywalkMcLeod was seen walking through the Skywalk on Tuesday afternoon. (RCMP)

“This was a horrific and tragic crime that took the lives of a mother and her two small children,” said Superintendent Rob Lasson, Officer in Charge of Major Crime Services. “Our priority is to locate and arrest Trevis as soon as possible and we are asking anyone with information on his whereabouts to call 911 immediately.”

McLeod was last seen wearing glasses, a dark-coloured ball cap, a black coat, black pants, black shoes and is carrying a black bag. Police believe that he does not have access to a vehicle and will be on foot.

The RCMP is warning the public that he is considered dangerous and should not be approached. 

"Everyone living or working in downtown Winnipeg needs to be aware that Trevis may be in the area. No one should hesitate to call 911 if he is seen," the release says. "RCMP and Winnipeg Police officers are actively patrolling and will respond immediately."