Explosion at California medical facility appears to be intentional act, source says

Explosion at California medical facility appears to be intentional act, source says  CNN Aliso Viejo deadly explosion likely an intentional act, official tells AP  KABC-TV 1 Dead, 3 Hurt In Suspicious Explosion At Southern California Office Complex  NPR Woman killed in 'suspicious' explosion at Aliso Viejo office building; authorities say blast appears intentional  Los Angeles TimesFull coverage