According to an Aljazeera report, 77 of 78 passengers were killed in a military plane crash Tuesday. The C-130 military transport aircraft — originally routed to land in Constantine, Algeria — reportedly skimmed a mountain before crashing. The lone survivor is being treated and has undergone surgery at the Constantine military hospital.

While the Aljazeera report noted that 57 bodies were recovered from the scene, Reuters reported that the remains of others can no longer be identified. Military personnel, military families and crew members were reported to have been on the flight.

“Several bodies were burnt to ashes,” a local official told Reuters.

This incident, thought to be caused by bad weather, is one of the worst in the country’s history, according to Reuters. In 2003, an Air Algerie crash killed 102 passengers.

Both planes departed from Algeria’s Tamanrasset province.

Aljazeera reported that conflict in Mali and Libya have called for additional military personnel and equipment in the province where a staple Algeria military base is located. The country — as announced by president Abdelaziz Bouteflika — will observe three days of mourning to pay the victims respect and remembrance.