According to media reports, the blast took place at about 11:30 a.m. when a remote control bomb fixed to a motorcycle parking along the road hit a vehicle of a state- owned oil and gas company in the Dera Allah Yar area of Jafarabad.
The explosives were strapped to a motorcycle. The victims was shifted to district headquarter hospital Dera Allah Yar.
Five of the seven people injured in the blast are said to be in critical conditions, said hospital sources. Police have cordoned off the area and a search operation is under way.
No group has claimed the responsibility for the attack yet. Both Taliban militants and Baloch separatist nationalists are blamed for violence in Balochistan.
In the past, OGDCL interests have been targeted in the province. Balochistan has long been the scene of a low-level insurgency by nationalists who say their movement is aimed at getting a greater share of profits from natural resources like natural gas extracted from their province.
