Indian investigators are examining evidence related to an Air India flight that experienced a sudden altitude drop mid-air last week, authorities announced on Tuesday. The Airbus A320, carrying 137 passengers and eight crew members, lost approximately 300 feet (91 meters) of altitude shortly after departing from Thailand’s Phuket for New Delhi on August 4. The flight landed safely in the Indian capital.

Local media reported that the pilot tested positive for marijuana, prompting scrutiny of his drug use. The incident has raised questions about safety protocols and the impact of substance use on aviation operations. Investigators are now reviewing all available data to determine the cause of the altitude loss and assess any potential risks.

The case highlights ongoing concerns about drug use among pilots and the need for stricter enforcement of regulations. While no injuries were reported, the incident has sparked discussions about the safety measures in place for commercial flights. Authorities have not yet released further details on the investigation’s progress.