The security personnel were returning in the truck after dropping food supplies for their colleagues at different check posts when the incident took place Thursday, the Online news agency said citing officials.
The terrorists planted the landmine in the Marwar area of Quetta, the capital of Balochistan Province.
The injured were rushed to a military hospital in the city.
The security officials have cordoned off the area and begun an investigation.
Published 10 July 2009, 03:58 IST