The Ofesi ya Prosecutor ku Blagoevgrad ikuyendetsa mlandu wa ngozi ya helikoputala pafupi ndi mudzi wa Garmen, Kumwera chakumadzulo Bulgaria, zomwe zinaphetsa woyendetsa ndegeyo. Zifukwa zitatu zomwe zingatheke zikufufuzidwa:

1) Kutayika kwakanthawi koyang'ana chifukwa cha nyengo yoipa monga chifunga, chifunga, kapena kuphimba mtambo wochepa;

2) Kulephera kwaukadaulo, mwina kuphatikiza injini kapena makina owongolera;

3) Thanzi la woyendetsa ndege likuyamba kufooka pambuyo ponyamuka.

Njira zoyeserera zisanachitike zidayambika chifukwa choyambitsa imfa chifukwa cha kusadziwa kapena kusasamala panthawi yantchito yokhala ndi chiopsezo chowonjezereka. Woyendetsa ndegeyo anali kupopera mbewu m'nkhalango pafupi ndi Garmen, ndipo adanyamuka mubwalo lamasewera la mudziwo muli chifunga chowuma atamaliza ntchito yake dzulo lake.