A U.S. congressional panel is investigating whether the Justice Department's $50 million fine against BP was adequate punishment for an explosion at the company's Texas oil refinery that killed 15 people and injured 170. Rep. John Dingell, who heads the House Energy and Commerce Committee, noted that the $50 million fine for criminal conduct BP admitted to in a plea agreement amounted to less than a single day of BP's profits in 2006 and 2007... BP spokesman Scott Dean declined to comment.