According to Balochistan Home Minister Mir Sarfaraz Bugti, the three militants were killed when security forces launched a search operation in the Dasht area of the district.
"They acted on an intelligence tip off and when they combed the area the militants retaliated," Bugti said.
He said one of the killed militants had been identified as a key commander of the Balochistan Republican Army.
A spokesman for the Frontier Corps said the militants were part of a group that was involved in the killing of outstation laborers who were working at Shadi Kor Dam.
Nawab Akbar Bugti was killed during a military operation in 2006 in the Dera Bugti district.
