WASHINGTON - US Homeland Security officials are reviewing 300,000 deportation cases with an eye towards speeding the deportation of serious criminals and reducing those of many illegal immigrants with no criminal record, officials said. The review began Thursday as the Department of Homeland Security started a nationwide training plan for enforcement agents and prosecuting attorneys, The New York Times reported. "We are empowering the attorneys nationally to make them more like federal prosecutors, who decide what cases to bring," a senior Homeland Security official, who asked not to be named, told The Times.