Lansing’s mayor is asking for the investigation of a white off-duty police officer captured on video pinning a black teen on the ground to be turned over to the Cook County sheriff’s office, officials said.

The officer, who officials did not name, also is being placed on administrative leave, pending the investigation’s findings, Lansing Mayor Patricia L. Eidam said. Officials would not say whether the Lansing officer would be paid during his leave.

The action comes as some local activists have called for the officer’s firing.

Lansing police were probing the incident, which happened June 24, but the mayor said in a statement said that an independent investigation ensures there’s no “appearance of impropriety.”

Sheriff’s office officials said they received the request from the mayor but added they have not yet confirmed whether they will conduct the investigation.

“My bottom line remains clear,” Eidam said in a statement. “I want all the facts reviewed, I want an objective conclusion to be reached, and I want recommendations on what corrective actions may need to be taken.”

Andrew M. Stroth, a lawyer representing the teen’s family, said Eidam’s actions were “swift” and “thoughtful” after he and the family had a meeting with Lansing’s police chief, mayor and city lawyers on Friday morning.

“Eidam wants to do the right thing,” Stroth said. “And we give her credit for her handling of the situation and for the fact that they want a third-party investigation.”

Stroth said the family wants the officer to ultimately be terminated.

“The family doesn’t want this to happen to anyone else’s kid,” Stroth said.

Lansing police couldn’t be reached for comment.

The incident came after Lansing police received a call regarding a fight involving approximately 30 individuals near 192nd Street and Oakwood Avenue. A police report said officers arrived to the scene after the fight ended and no arrests were made.

A 12-year-old black boy then told officers he was in the area when a white teen gave him a beverage that might have contained drugs, the report said. Eventually, officials said, the boy’s brother had a “physical confrontation” that resulted in the white teen being repeatedly struck in the face.

The off-duty officer, who lives in the neighborhood, later encountered the white teen, who was bleeding from his face, on the officer’s property. As the officer spoke to the white teen, the report said, a 15-year-old black teen approached the pair. Both juveniles then proceeded to leave the officer’s property, but the officer told them to stay until police arrived. The teens refused, and the officer then physically detained the black teen.

A video showed the officer pinning the teen down. At one point, the man threatened to kill the youth, the video showed.

gporterjr@tronc.com