At least 20 workers at a dam construction site in the south-western Pakistani province of Balochistan have been killed while they slept by unknown gunmen, officials say.
Police say that the gunmen overpowered eight security guards, and shot the labourers on Friday night.
The attackers fled on motorcycles. No group has claimed responsibility.
Taliban militants, Baloch separatists and other groups fight in the Balochistan region, which borders Iran.
Rights groups often accuse government forces of arbitrary killings and enforced disappearances while fighting against a low-intensity insurgency by nationalist and separatist Baloch rebel groups.
The rebels have themselves been accused of abuses.
The government and the insurgents – who want a greater share of revenue from the province’s substantial gas and mineral resources as well as more autonomy – both deny the claims.
Police told Pakistani media that the attack appears to have been an act of targeted killing – all the dead were from outside Balochistan.
The attack took place in the south-western town of Turbat, police say, which is considered to be one of the restive areas of Balochistan. It is also the home town of the chief minister.
Attacks on labourers from outside the province are not uncommon in Balochistan. In October eight workers were reported to have been kidnapped from a poultry farm near the industrial town of Hub.