( CNN ) -- A tanker ship loaded with oil in the Port of Port Arthur , Texas , collided with two barges being towed by a tug boat , resulting in a spill of about 450,000 gallons of crude , according to the U.S. Coast Guard . No injuries were reported , but a 50-block area around the port was evacuated out of caution , as the tanker was carrying a type of oil containing sulfide . The portion of the port where the collision occurred will remain closed until it is deemed safe for workers and other vessels to return , Petty Officer Richard Brahm said . The Coast Guard has deployed 4,000 feet of boom , which helps corral the oil , with 10,000 more feet available for cleanup . Also on the scene are oil skimmers , three boom vessels , four 25-foot Coast Guard boats , the Coast Guard cutter Manowar and authorities from the local police and fire departments . Photos show gash in tanker 's side . The spill is in a `` very still '' area of the waterway , which is helping contain it , Brahm said . `` There is almost no water flow in the area , so the oil is n't spreading out , '' he said . The port is primarily for industrial use , but Coast Guard Capt . John J. Plunkett said there are environmental concerns to marsh areas both up- and downstream of the spill . He said the spill had n't reached those areas . The Coast Guard did not indicate how long cleanup will take . The investigation into the cause of the collision is ongoing . Port Arthur is about 100 miles east of Houston , near the Louisiana border . The biggest oil spill in U.S. history occurred in 1989 when the Exxon Valdez ran aground on a reef in the Gulf of Alaska , resulting in the spill of 11 million gallons of crude .
Coast Guard did not indicate how long cleanup will take ; investigation ongoing . - The U.S. Navy said it is investigating the cause of a fire that broke out on board an aircraft carrier in San Diego Bay early Saturday. Coast Guard deployed 4,000 feet of boom , four 25-foot boats and other vessels for cleanup .