The Latest on the investigation into a triple homicide at a Southern California home (all times local):

3:25 p.m.

Police are expected to release details of their investigation into a triple homicide inside a Southern California home over the weekend.

The Fullerton Police Department will hold a 4 p.m. news conference Sunday to discuss the probe which began after a child called 911 to report her parents had died.

First responders who were dispatched to the home in Fullerton, a suburb 26 miles southeast of Los Angeles, on Saturday discovered two men and a woman dead.

Two children were found unharmed, and police were searching for their 17-year-old sister who is considered missing and at-risk.

Police said there were obvious signs of trauma to the bodies. They have not released details on their cause of death or their identities.