Story highlights Witness on plane says unruly passenger talked about someone trying to bring plane down

Another passenger tells CNN man said plane was going too slow

Airport spokeswoman: Passenger not arrested or charged with a crime so far

Dulles, Virginia (CNN) Two quick-thinking passengers in the third row of a United flight to Denver tackled and subdued a man who was heading toward the cockpit, other travelers on the plane told CNN on Tuesday.

The incident started shortly after United Flight 1074 took off around 10:15 p.m. Monday from Dulles International Airport in suburban Washington.

The Boeing 737 jet was supposed to take its 33 passengers and six crew members to Denver, but turned back because the unnamed passenger "failed to comply with crew instructions," United Airlines spokesman Luke Punzenberger said.

Joshua Lindstrom told "Anderson Cooper 360˚" Tuesday night that a man was acting strangely as he moved up the aisle.

"The flight attendant gave some sort of command to stand back, and he turned and started heading toward the cockpit. And the guy in 3E was a lightning bolt and just jumped out of his seat and took the guy down to the ground."

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