(WBIR - Denver, CO) A "security incident" was reported Friday night on a Frontier Airlines flight from Knoxville to Denver.
A suspect was taken into custody after Flight 601 landed safely at Denver International Airport, KUSA-TV reported.
Sources told KUSA-TV that the suspect was making threats that made passengers uneasy.
The FBI is calling it a possible "security incident."
None of the 136 passengers were injured.
Airport officials told KUSA that passengers were being re-screened.
KUSA, which is WBIR's Gannett sister station, attempted to contact Frontier but had not heard back as of midnight Eastern time.