Motive in Boulder shooting is still a mystery, police say

Ahmad Al Aliwi Alissa, 21, appears before Boulder District Court Judge Thomas Mulvahill at the Boulder County Justice Center in Boulder, Colo. on Thursday, March 25, 2021. Three days after he was led away in handcuffs from a Boulder supermarket where 10 people were fatally shot, Alissa appeared in court for the first time and his defense lawyer asked for a mental health assessment "to address his mental illness." (Helen H. Richardson/The Denver Post via AP, Pool)

BOULDER, Colo. — Investigators searching for answers after the mass shooting in Boulder this week still do not know why a gunman fatally shot 10 people at a crowded grocery store, the police chief said Friday.