NEW : Biden spoke at a downtown rally organized by the Michigan AFL-CIO . Metal detectors were found in an abandoned house , inside truck , source says . Comment: The police are looking for a suspect who is believed to have been involved with the murder of two men and their dog on Friday night. The rental truck was stolen from a Detroit hotel , found near hospital . Vice President Joe Biden spoke at union rally .
NEW : Metal detectors were found in an abandoned house , inside truck , source says . Comment: The police are looking for a suspect who is believed to have been involved with the murder of two men and their dog on Friday night. The rental truck was stolen from a Detroit hotel , found near hospital . Vice President Joe Biden spoke at union rally .