05/19/2010 05:12 am ET | Updated May 25, 2011

Cop's Racist Tirade Recorded On Cell Phone, Investigation Launched

Passengers got an unusual answer when they asked a Chicago police officer why they'd been pulled over Tuesday night.

"Because you're f***ing black," the cop told them.

The officer's lengthy, profanity-riddled tirade was recorded by one of the passengers' cell phones, and obtained by WGN-TV. (Scroll down for video of the WGN report, including clips from the recording.)

Now, police superintendent Jody Weis is looking in to the incident. From the Chicago Tribune's report:

"The manner in which the officer and subject interacted was unacceptable," Police Supt. Jody Weis said in a prepared statement. "Officers are trained and expected to deal with these situations in a professional manner, free of unnecessary sarcasm."

The driver was ultimately issued three tickets, for a seat belt violation, no insurance, and driving with a suspended license. He told WGN that he did not contest the tickets, but was surprised and offended by the officer's rant.

The officer, whose name has not been released, has been placed on desk duty while the investigation takes place.

Watch the WGN report: