Business acquaintance of California blast victim arrested

In this photo taken from video provided by KABC-TV, children are evacuated from a preschool across the street from a building that was rocked by an explosion in Aliso Viejo, Calif., Tuesday afternoon, May 15, 2018. None of these children were hurt. Authorities say one person is dead and several others have injuries. The cause of the blast is being investigated. (KABC-TV via AP)

ALISO VIEJO, Calif. — A business acquaintance of the woman killed in a Southern California office building explosion has been arrested on suspicion of possessing an unregistered destructive device, the FBI said Thursday.