Copenhagen police are investigating a threat made against planes belonging to Turkish airline Atlasglobal. The city's airport closed 10 gates after being alerted of the threat by police.

"Copenhagen police have said there is a threat against all Atlasglobal's planes in Europe," a Copenhagen Airport spokesman said, as quoted by Reuters.

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One airplane was prevented from taking off due to the incident. It was moved to a remote part of the airport while police carried out their investigation.

Copenhagen Airport tweeted at the time that gates C30-C39 had been closed amid a "police investigation." It later said the airport was "back to normal" and operating with minimal delays.

Due to police investigation, we have cleared gate C30-39. Few delays are to be expected. Follow your flight on cph.dk or CPH App. — Copenhagen Airport (@CPHAirports) November 13, 2017

The airport is now back to normal. Only a few delays - please follow your flight on cph.dk or on CPH App. We apologize for the inconvenience. — Copenhagen Airport (@CPHAirports) November 13, 2017

Atlasglobal later confirmed that flights had resumed at the airport after security checks found “nothing negative” following the threat.

“After receiving notice concerning the Atlasglobal flights in Copenhagen Airport, security units were contacted,” the airline said. It added that “necessary security measures were taken, and security units conducted necessary inspections.”

Atlasglobal is a Turkish airline headquartered in Istanbul, which operates domestic and international passenger services and charter flights. It operated under the name Atlasjet until March 2015.