An unidentified marcher is detained, and later released, by the Los Angeles Police Department during an immigration rally in Los Angeles May 17, 2007. The rally was held as a response to the Los Angeles Police Department's action at a May 1st rally, when they used force to disperse the crowd. A deal between leading senators would grant millions of undocumented immigrants lawful status, but other reform advocates warned any celebration was premature. Picture taken May 17, 2007. REUTERS/Staff (UNITED STATES)