ONTARIO, Calif.—Authorities sought Wednesday to identify the bodies of two people killed in a huge fireworks explosion in a Southern California neighborhood, saying they have not yet determined if the victims are two cousins reported missing since the blast. Tuesday’s explosion left a vast debris field scattered over the inland neighborhood in Ontario, California, and bomb teams were sent in to defuse any unexploded fireworks and make the area safe for the return of evacuated residents. Though two people were killed in the explosion, the coroner’s office has not yet been able to identify their bodies, Ontario Police Chief Mike Lorenz said at a media briefing Wednesday. The two bodies were discovered in the backyard of the property where the blasts began. Reported missing are cousins Alex Paez, 38, and Ceasar Paez, 20. They have been associated with the property where the explosion occurred but officials have not confirmed that …