Five days ago, in the northeastern port city of Dalian, China, two oil pipelines exploded, sending flames hundreds of feet into the air and burning for over 15 hours, destroying several structures - the cause of the explosion is under investigation. The damaged pipes released thousands of gallons of oil, which flowed into the nearby harbor and the Yellow Sea. The total amount of oil spilled is still not clear, though China Central Television earlier reported an estimate of 1,500 tons (400,000 gallons), as compared to the estimated 94 - 184 million gallons in the BP oil spill off the Louisiana coast. The oil slick has now grown to at least 430 square kilometers (165 sq mi), forcing beaches and port facilities to close while government workers and local fishermen work to contain and clean up the spill. Firefighters walk near an oil pipeline blast site in Dalian, Liaoning province, China early on July 17, 2010. Firefighters later extinguished the fire that raged for more than 15 hours after two oil pipelines exploded in the port of Dalian, the Xinhua news agency said. Two workers try to rescue their co-worker (left) from drowning in the oil slick while he was attempting to fix an underwater pump during the oil spill clean-up operations at Dalian's Port on July 20, 2010. Oil coats a boat rope on July 18, 2010 after a huge spill following the fire at the port in Dalian, China.