As the investigation into the deadly firefighter ambush in Idaho over the weekend continues, police are still trying to piece together why suspect Wess Roley allegedly instigated the attack, a source familiar told ABC News.

The sniper, 20-year-old Wess Roley, who opened fire on the first responders after they asked him to move his car, officials say, had ties to California

Officials have identified the two firefighters who were killed in an ambush shooting as they responded to a wildfire report near Coeur d'Alene, Idaho, on Sunday, June 29