A Friday hearing will focus on motions to dismiss claims in the Gulf of Mexico oil spill, including claims from cleanup workers who say they are sick from exposure to toxic chemicals. Thousands of plaintiffs have filed hundreds of claims for personal injuries, property damages and other causes stemming from the April 20, 2010 explosion of BP's Deepwater Horizon drill rig that killed 11 people and dumped millions of barrels of oil into the Gulf of Mexico. Almost all of the claims have been consolidated in New Orleans Federal Court under U.S. District Judge Carl Barbier. [refers to Transocean, Halliburton, Cameron International, Nalco]