Speaking to the Islamic Republic News Agency (IRNA) on condition of anonymity, the source said that they were kidnapped in Lulakdan village at 4-5 am.
No security official has so far commented on the accident.
Lulakdan is a village in Poshtkuh Rural District, in the Central District of Khash Town, Sistan, Baluchestan Province.
Attacks by terrorists and smuggling bands sometimes happen in the the area, which is close to Pakistan border.