A little more info, from CBC:
3 slain siblings found in home in Merritt, B.C.
Hours after cordoning off neighbourhood, RCMP says they're not searching for a suspect
Last Updated: Monday, April 7, 2008 | 12:10 AM ET
The Canadian Press
Three siblings under the age of 10 have been found slain in a home in Merritt, B.C., RCMP confirmed late Sunday, hours after they cordoned off a neighbourhood and warned people to stay in their homes.
"Three children, they're three siblings," Const. Tracy Dunsmore told reporters late Sunday in Merritt, located 270 kilometres northeast of Vancouver.
Dunsmore said that nobody had been taken into custody in relation to the deaths, nor were police searching for any suspect.
Police said in a news release that the slayings were not a random act.
"We don't feel there's a threat to the community," Dunsmore told reporters.
Neighbours said police descended earlier in the day on the area around a mobile home. Some neighbours said a woman and three children lived in the home, while others said a couple lived there with their children.
"Him and his wife have been fighting in the past here," one neighbour told the Kamloops radio station CHNL.
"I understand … they were having some sort of dispute. She went downtown to get some groceries and came home."
RCMP had the neighbourhood cordoned off for most of the day, combing the home and going door to door to interview neighbours, asking whether they had heard or seen anything on Saturday night.
Police warned neighbours to stay inside
Initially, police warned people to stay inside their homes, according to people who live near the mobile home.
"There's lots of police cars and the road is blocked off. We've just heard that some kids were killed over there," neighbour Noreen McPhail said shortly after police arrived at the scene.
McPhail was ushered back into her house by police when she tried to leave.
"I went to go downtown and I was told to back off," she said, adding that a police officer "just put her hand up and said to back off so I just had to come in my driveway."
RCMP cruisers were parked outside the mobile home all day.
"The tape is right across the whole road," McPhail said. "I'm basically in here, I can't get out at all."
Neighbours said police gave them no details of what had happened inside the home.
"The police have been here all day and interviewed me," said a neighbour who didn't want to give his name. "They've got it all taped off."
Family had moved in recently: neighbour
People who lived in the area said it is a quiet street where most neighbours know one another. The family in the home had recently moved up from the Lower Mainland, said one neighbour.
"They been in there for a few months and I really didn't know them at all. There were three children and a woman," said the neighbour.
The Canadian Press
We will see what the morning brings. The kids are pretty freaked out about this although we did not know the family.