Threats against a black Minneapolis officer, Sergeant Alisa Clemons, are being investigated by the Hennepin County Sheriff's office. Clemons won reinstatement to her police job and back pay last year after an arbitrator ruled the city wrongly accused her of sending racist hate mail. Clemons' supporters see the threats made against her last week as a continuation by officers in the police department of a campaign to force her out. Minnesota Public Radio's Dan Olson has more.