Firefighters on land, in the air and on the water on Monday were still battling a blaze on a Navy ship that injured at least 21 people and sent smoke billowing over San Diego. The fire began Sunday morning in a vehicle storage area aboard the USS Bonhomme Richard, according to Rear Adm. Philip Sobeck, who said 17 sailors and four others, including firefighters, were treated at hospitals for smoke inhalation or other minor injuries.