Jakarta, Jan. 22 -- Indonesian authorities have recovered the black box of an ATR 42-500 aircraft that crashed in South Sulawesi, marking a key breakthrough as rescue teams continue searching the mountainous crash site for remaining victims.

The recorder was found Wednesday by Army soldiers assigned to a joint search and rescue team after five days of operations on Mount Bulusaraung.

Army spokesman Brig. Gen. Donny Pramono said the discovery followed intensive sweeps by Battalion 700 troops, a rapid response unit from state-owned cement producer Tonasa, and the national search agency Basarnas.

He said the black box consisted of two orange units located near the aircraft's tail section at the crash site.

The devices have been secured a...