NEW DELHI (AP) — India’s aviation ministry said Wednesday it was awaiting drug test results for the captain of an Air India flight that dropped about 300 feet (90 meters) suddenly midair last week, injuring 24 passengers and crew members.

The incident on the Airbus A320 took place shortly after it took off on Aug. 4 from Phuket, Thailand to New Delhi while carrying 137 passengers, including three infants and eight crew members. The aircraft later stabilized and landed safely in New Delhi, officials said.