Aliso Viejo blast: Deadly California explosion 'not an accident'

Investigators believe an explosion at a spa in southern California that killed one woman may have been intentional, police say.

Tuesday's blast at the two-storey building in Aliso Viejo, south of Los Angeles, also injured two people.

Local authorities say they suspect the device may have been delivered by parcel, but they do not know how it entered the building.

Police have identified the woman killed by the blast as the owner of the spa.

Police say it is unclear if Ildiko Krajnyak, 48, was targeted.