A Jordanian-American passenger has been restrained by crew members on a Belgrade-bound Lufthansa flight after fumbling with the emergency exit door.

The man, a Jordanian with a United States passport, kept changing seats after takeoff and started tampering with the emergency exit door about one hour into the flight from Frankfurt on Sunday, a spokesman for the German carrier said.

Crew members and passengers managed to restrain him and the man kept him at bay for the rest of the flight, the spokesman said.

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“There was no threat to the safety of the flight,” the spokesman said, adding that the man was arrested by Serbian police after the LH 1406 service landed on time in Belgrade.

“A passenger got up and tried to do something at the door, but was stopped by crew members and other passengers.

“It was a normal door, which of course cannot be opened in-flight… it was not the cockpit door.”

The flight eventually landed in Belgrade, according to RT. 

A member of the Serbian handball team – who were on board – Milan Djukic, said the man looked suspicious even before the flight was boarded.

“About halfway into the flight he tried to open a plane door, but the cabin crew stopped him,” Djukic told RT.