TISDALE, Sask. -- RCMP say they believe a man went to a mobile home in rural Saskatchewan and killed a woman and her three children, but spared an infant.

They say he then took the six-month-old baby and drove 130 kilometres from the town of Tisdale to Prince Albert, where he killed himself.

"The infant was not injured and is now being cared for by family members," RCMP spokeswoman Mandy Maier told reporters Wednesday.

She said officers received a call from a family member about supper-time Tuesday saying that the woman and children hadn't been heard from all day and couldn't be reached.

About six hours later, after officers obtained a search warrant, they found the woman and children dead in a trailer in Wicks' Mobile Home Park. The children were all under the age of nine.

Police have not revealed how they died, but believe they were killed before they were reported missing.

Maier said an investigation quickly led officers to the suspect in Prince Albert. Maier said the baby and two other adults were found alive in a home there. It's not expected that they will face criminal charges.

She said the suspect was known to the victims but could not give more details on their relationship or a possible motive.

"There is no risk to public safety and investigators do not anticipate laying any criminal charges relating to these four deaths," she said.

No names have been released.

"It's a shocker," said the manager of the Wicks' Mobile Home Park and Gas Bar on the edge of the town. Looking out his window, he said he could see several RCMP cruisers parked near one of his trailers surrounded with yellow tape.

He wouldn't give his name, but said the dead woman and children had lived in one of his rental trailers for the past eight months, along with her husband and a young baby. He described them as a quiet and friendly family.

RCMP phoned him late Tuesday.

"I was called to come down at midnight and asked if I had a spare key for the place."

He said the husband of the dead woman was also there and appeared very distraught.

"About all we can say is yes, we are in shock, and very saddened by this event," said Tisdale mayor Al Jellicoe.

"We are a very close-knit community and, when a tragic event happens here, it affects us all."

Tisdale, a town of about 3,200 people, is located 210 kilometres northeast of Saskatoon.

It may be best known as the hometown of comedian Brent Butt, who modeled his popular "Corner Gas" TV show after his experiences working in a gas station in the community.

Premier Brad Wall also sent condolences out on Twitter soon after news spread of the killings.

"Our thoughts and prayers to the family, friends and community dealing with the indescribable tragedy in Tisdale," he said.