Pakistan’s state-run airline says it will ground 150 pilots, accusing them of obtaining licences by having others take exams for them, an accusation that followed a probe into last month’s crash that killed 98 people in Karachi.

Abdullah Hafeez, a spokesman for Pakistan International Airlines, did not give additional details about the alleged cheating but said a process to fire the pilots had been initiated.

“We will make it sure that such unqualified pilots never fly aircraft again,” he told The Associated Press. He said the safety of passengers was the airline’s top priority.

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Alarmed over the situation, the International Air Transport Association said it was following reports from Pakistan “regarding fake pilot licences, which are concerning and represent a serious lapse in the licensing and safety oversight by the aviation regulator”.

The global airline organisation said it was seeking more information.

The move by PIA to ground the pilots comes a day after the country’s aviation minister, Ghulam Sarwar Khan, said 262 out of 860 Pakistani pilots had “fake” licences. He made the revelation while presenting preliminary findings of a probe to parliament into the May 22 Airbus A320 crash.

The announcement stunned politicians present in the National Assembly and shocked family members of passengers who died last month when Flight PK8303 went down after departing from the eastern city of Lahore, crashing in a congested residential area in Karachi. The crash killed 98 people, including 97 passengers and crew, as well as a girl on the ground. There were only two survivors on board the plane.

Neither Mr Khan nor Mr Hafeez released additional details about the alleged methods used by the pilots to wrongfully obtain licences to fly commercial planes.

Mr Khan said only that they did not take examinations themselves to get the required certificates, which are issued by the civil aviation authority. But officials familiar with the process involved in issuing licences said an unspecified number of people who had the skills to fly a plane but lacked technical knowledge had in the past bribed qualified persons to take exams for them. They didn’t elaborate.

The officials, who spoke on condition of anonymity because they were not authorised to discuss the matter, said Pakistan International Airlines learned about the scandal two years ago and fired at least four pilots at the time on accusations of falsifying exams to obtain a licence from the civil aviation authority.

Mr Hafeez said notices were being issued to all those pilots who he believed had tainted licences.

Shortly after the May 22 crash, Pakistan announced it would investigate the incident and share its findings.

In presenting preliminary findings of the probe to parliament on Wednesday, Mr Khan said the pilot, before making his first failed landing attempt, did not pay attention to warnings from the air control tower when he was told the plane was too high to land. However, he said the pilot and co-pilot were medically fit and qualified to fly.

The crash took place when the plane attempted to land a second time. At that point, air traffic control told the pilot three times that the plane was too low to land but he refused to listen, saying he would manage, Mr Khan said. The minister added that, for its part, air traffic control did not inform the pilots about damage caused to the engines after the plane’s first failed landing attempt.

“The engines of the plane were damaged when they scraped the runway but the air traffic control did not inform the pilot,” he said.