U.S. sailors and civilian fire crews continue to battle the blaze on amphibious assault ship USS Bonhomme Richard for a fourth day. Over 60 personnel have been treated for minor injuries. No one is in hospital. The U.S. Navy officials say they will conduct a thorough investigation. Around 160 sailors were aboard when the fire was reported on Sunday morning. The Bonhomme Richard has about 1,000 crew members. It's been docked in San Diego since 2018 undergoing maintenance.