United flight from Chicago makes emergency landing after passenger's 'multiple attempts' to breach cockpit

The flight landed in Madison's Dane County Regional Airport roughly 90 minutes after takeoff, according to flight tracking data.

"I do not believe they ever cuffed him, but they were able to finally get control of him after multiple attempts to try to breach the cockpit," a crew member says on air traffic control audio. 

"I believe at this point he is seated in a seat and flanked with law enforcement officers on either side."

"We're getting word that there is five off-duty law enforcement on the plane that have the individual detained," a sheriff's office member can be heard saying.

At one point in the timespan of the passenger being removed, a sheriff's office employee asks for a Russian translator. "On the odd chance, would there be anyone for Russian translation?" the employee can be heard asking. 

Fox News Digital contacted Madison Police Department, Dane County Sheriff's Office, TSA, the FBI and the Dane County Regional Airport for more information.