Authorities are currently “looking for details” about the aircraft’s whereabouts, the press service of the Main Directorate of the Russian Emergencies Ministry for the Kamchatka Territory said. It’s believed that there are 23 people and six crew members onboard the plane.

Russian officials are investigating whether the plane’s disappearance was the result of safety rules violations. Two helicopters and an aircraft are involved in search operations near Palana, where the An-26 is believed to have gone missing.