Indonesia’s transport ministry will launch an investigation after two Batik Air pilots fell asleep during a recent flight, according to state news agency Antara, citing the ministry’s civil aviation director-general M Kristi Endah Murni.

According to a preliminary report released Saturday by the National Transportation Safety Committee (KNKT), both the pilot and co-pilot fell asleep simultaneously for 28 minutes during a flight from Kendari in Southeast Sulawesi province to the capital Jakarta on January 25, causing navigational errors as “the aircraft was not in the correct flight path.”