Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings. Investigators believe a massive fire that erupted on the Navy ship the USS Bonhomme Richard may have been intentionally set, and a sailor has been identified as a possible suspect, two defense officials confirmed Wednesday.

A search for seven Camp Pendleton Marines and a U.S. Navy sailor was under way Friday following a "training mishap" with an amphibious assault vehicle (AAV) off the coast of Southern California, according to the United States Marine Corps. One Marine died following the training incident, and two others were severely injured. Fifteen Marines and one sailor were inside the AAV when they reported taking on water at approximately 5:45 p.m Thursday. The group was traveling from the shores of San Clemente Island

Special Agent Wesley Petonak, 34, was sitting at his desk in November 2018 when he came across a PowerPoint presentation file that alarmed him. A nine-year veteran at San Diego’s Homeland Security Investigations office, Petonak knew firsthand the importance of intelligence gathering for successful immigration enforcement at the U.S.-Mexico border. But the PowerPoint was different. Nine of the slides revealed that agents working under “Operation Secure Line” — a codename for the government’s response to a caravan of thousands of Central American migrants approaching the southern border — were also tracking the movements of journalists, attorneys and humanitarian aid workers.