U.S. Attorney General Eric Holder said Tuesday the Justice Department has launched a criminal investigation into the massive oil spill spreading through the Gulf of Mexico..."We have begun both a criminal as well as a civil investigation as is our obligation under the law," Holder said. "We have what we think is a sufficient case to have begun a criminal investigation"...Among other things, Holder said Justice Department lawyers are examining possible violations of the Clean Water Act and the Oil Pollution Act...BP responded in a statement that it "will cooperate with any inquiry..." [Senator B. Boxer] said... "What is happening in the Gulf -- eleven people dead, and an entire ecosystem and the jobs that depend on it at risk -- justifies a thorough criminal investigation." [includes video]