An evacuation order has been lifted at Quebec City’s airport following a police investigation Saturday evening.

Police officers were on scene at the transit hub Saturday night to carry out a “police operation,” police said in a tweet. Travellers were asked to leave the terminal, and an access road was closed off.

Neither police nor officials with the Jean-Lesage International Airport of Quebec have confirmed the cause of the evacuation.

The evacuation was announced at 7:40 p.m. and the all-clear was given shortly after 9 p.m.

"Passengers and employees re-entered the terminal. Operations are back to normal," the airport said in a tweet.

Evacuation of the terminal (city side) in collaboration with the @SPVQ_police. More details to come. — Aéroport de Québec (@QuebecYQB) June 1, 2019

Evacuation of the terminal: Access road to the terminal temporarily closed. More details to come. — Aéroport de Québec (@QuebecYQB) June 2, 2019

OPÉRATION|Opération policière en cours à l’aéroport de Québec .@QuebecYQB

Plus d’informations à venir — Service de police de la Ville de Québec (@SPVQ_police) June 2, 2019

9:08 pm: Passengers and employees re-entered the terminal. Operations are back to normal. — Aéroport de Québec (@QuebecYQB) June 2, 2019