The nine accused were arrested in a raid carried out by Frontier Corps (FC) on an intelligence cue.
The suspects confessed that they were involved in the killing of the workers in Turbat.
It should be noted that the case of the incident was registered against Baloch Liberation Front Chief Allah Nazar and others at Turbat Police Station.
Twenty labourers working on a construction project were gunned down at point blank range by armed men in Turbat.
Balochistan is plagued by violence, with separatists seeking control over the province’s rich oil, gas and mineral resources.
Terrorist factions in the south-western region of the country have also targeted outsiders in the past as well.