A United Airlines plane bound from Denver to California returned to the gate before takeoff after a man complained about three other passengers.
Denver police spokesman Sonny Jackson says United Airlines Flight 593 was supposed to be headed to Santa Ana, Calif. But it returned to the gate at Denver International Airport before takeoff around 10 p.m. Thursday. Law enforcement officials met the plane at the gate.
Three men whose actions were reportedly suspicious and the male passenger who complained were taken off the plane and questioned separately. Authorities didn't say what the man found suspicious. The plane was searched and left an hour and a half later.
No arrests were made. All four were released early Friday.
United spokesman Charlie Hobart says the airline cooperated with authorities.