At least 50 outbound flights were delayed, while 9 arriving flights were diverted after a hoax fire alarm went off at Singapore’s Changi Control Tower. The alarm also necessitated an evacuation, leading to a large-scale flight disruption on Thursday. The control tower was evacuated after a fire suppression system was activated, said the Civil Aviation Authority of Singapore (CAAS).
Flight operations at Changi Airport, which were disrupted just after midnight, were restored at 1.40 am after the control tower resumed operations, said Rosly Saad, director of air traffic services at CAAS.
"There was no fire," the Channel News Asia quoted Rosly as saying.
"In the interim, air traffic control services were provided from back-up positions," he added.
Investigations into the cause of the activation are ongoing. During the disruption, 50 departure flights were delayed by 30 minutes or more and nine arriving flights were diverted.
Some passengers affected by the disruption said they were delayed for about two hours, according to media reports on Thursday.