Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Obama, Gulf Coast Residents Mark Oil Spill Anniversary VOA News April 20, 2011 An oil-drenched bird struggles to climb onto a boom from the waters of Barataria Bay, Louisiana, which are filled with oil from the BP Deepwater Horizon oil spill (File Photo - June 26, 2010) Photo: AP An oil-drenched bird struggles to climb onto a boom from the waters of Barataria Bay, Louisiana, which are filled with oil from the BP Deepwater Horizon oil spill (File Photo - June 26, 2010) U.S. President Barack Obama says Americans have made significant progress in cleaning up last year's prolonged oil spill in the Gulf of Mexico, but he says the job is not done. Obama made the statement Wednesday, the one-year anniversary of the explosion on the Deepwater Horizon oil rig that killed 11 people and touched off an 85-day, underwater oil leak. It was the worst offshore oil spill in U.S. history. Obama said he continues to hold the BP oil company and other responsible parties fully accountable for the painful losses they have caused. Communities on the U.S. Gulf Coast are expected to mark the anniversary with gatherings focused on environmental awareness. Experts say while the initial damage does not look as bad as they feared, it will be years before the full effect of the spill on the environment is known. Tourists have been returning to the beaches this season, after the crisis at peak season last year prompted many to change their vacation plans. But fishermen say their business has not recovered. And residents say the sand and soil on the coast is still saturated with foul-smelling, oily residue. The United States announced in December that it is suing oil giant BP and eight other companies for their roles in the spill. .