Threats against a black Minneapolis police officer, Sergeant Alisa Clemons, are being investigated by the Hennepin County Sheriff's department. Clemons won re-instatement to her police job two years ago after an arbitrator ruled the city wrongly accused her of sending racist hate mail. Clemons' supporters see the new threats made against her last week as continuation of a campaign by people in the police department to force her out. Minnesota Public Radio's Dan Olson has more.