Authorities are warning carjackers in Detroit and Flint that they could face federal charges - including the death penalty.
U.S. Attorney Barbara McQuade and Detroit Police Chief James Craig on Monday announced the new media campaign that includes billboards and public service announcements.
Federal law calls for up to 15 years in prison for armed carjackings, 25 years if a victim is seriously injured and life or the federal death penalty if someone is murdered during a carjacking. Additional years are tacked on for using guns.
McQuade says "carjackers create an unacceptable risk of physical harm or death and instill fear" in the community.
Detroit police say 165 carjackings have been reported so far this year in Detroit.