The attack happened at a stone-crushing plant at Santsar, around 70 kilometres (45 miles) north of the Gwadar port.
"Gunmen came during the night and attacked. They set fire to machinery at the plant, kidnapped the owner and three labourers," local official Dostain Baloch told AFP.
"They took away all of them and later on, during the night, they killed the three labourers and discarded their bodies. The owner is still with them," he added.
Another local official, Mohammed Akbar, and Mohammed Omar, the partner of the kidnapped owner, confirmed the attack.
Pakistan has approved the transfer of Gwadar from Singapore's PSA International to the state-owned China Overseas Port Holdings Limited.
The Pakistanis pitched the deal as an energy and trade corridor that would connect China to the Arabian Sea and Strait of Hormuz, a gateway for a third of the world's traded oil, overland through an expanded Karakoram Highway.
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May Allah rest there soul and give strength to the family.. It's now time for the goverment to take action else will loose this land...
The "Muslim" who kills another Muslim is no longer Muslim. Its an unforgiveable sin. Sad to see some "Muslims" become proxies for foreign powers to disrupt Gwadar.
Atleast Musharraf was right in this aspect,as he said "they would not even know, what hit them "