Pakistan Tehreek-e-Insaf chairman Imran Khan was questioned by the country’s anti-corruption body on Tuesday in connection with the alleged misuse of helicopters by the Khyber Pakhtunkhwa government when his party was in power, reported Dawn.

Khan appeared before the National Accountability Bureau’s office in Peshawar, where the agency gave him a list of questions, Dawn quoted the bureau’s officials as saying. Officials interrogated Khan for more than an hour and asked him to answer the list of questions within 15 days.

The case is related to allegations that Khan caused a loss of Rs 2.17 million to the provincial exchequer by using the Khyber Pakhtunkhwa government’s helicopters for over 72 hours, according to PTI. He was not allowed to take the aircraft for his personal use.

Earlier, Khan had been issued a notice to appear before the NAB on July 18. Citing elections in the country, Khan failed to appear and his lawyer filed an appeal for more time. On August 3, the NAB asked Khan to appear before it for questioning. Khan has said that the case is politically motivated and has denied any wrongdoing.

Khan, whose party emerged the single-largest in national elections held on July 25, will be sworn in as the new prime minister next week.