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Three of the injured officers are still in serious condition and are undergoing hospital care, according to the administration of Sibi's Joint Military Hospital.
Separatists have been waging an insurgency in Balochistan, Pakistan's largest province by area, for decades. They blame the government's monopoly and exploitation of the area's mineral wealth for their demands for independence.
The blast on March 6 was the third significant assault in as many months on Pakistani security personnel.
After militants stormed the police headquarters in Karachi, Pakistan's southern city, at least four people were murdered and 14 others were hurt in February. According to spokesman Mohammad Khorasani, the Tehreek Taliban Pakistan (TTP), a branch of the Taliban in Pakistan, took credit for the assault.
In January, at least 100 individuals largely police officials - killed after a suicide explosion ripped through a mosque in the northern city of Peshawar, marking one of the bloodiest assaults in the country in years.
Prior to the terrorist group's top spokesperson later denying involvement in the incident, TTP leaders first claimed the blast was "revenge" for the murder of a TTP militant last year.
