Karachi- Pakistan's top security official said on Wednesday the government would complete its inquiry into the so-called honour killing of five women in the south-western province of Balochistan within a week and would make it public shortly.

"The inquiry will be completed within four to five days and we will make it public very soon," Rehman Malik, security advisor to Prime Minister Yousaf Raza Gilani, told newsmen in the southern port city Karachi.

Pakistan is the focus of an international outcry over the alleged "buried alive" deaths in July of five women who married men of their own choice in the country's conservative heartland.

Police on Tuesday exhumed the bodies of two young women from the same grave, around 10 kilometres from the women's Babacot village in Nasirabad district.

Police said women were buried the same clothes they were wearing at the time of their deaths.

Under old Baloch laws, women's bodies are not wrapped in traditional Islamic white cotton shrouds nor are customary burial religious rituals preformed if they were killed over violating honour codes or accused of lacking chastity.

Malik said the grave of the third women was still unidentified but would soon be located, while confirming the bodies were bullet-riddled. But he said it was not known whether the women were strangled to death before being shot or were simply shot and buried while still alive and injured.

"Only post-mortem will answer these questions," he said.

The other two women, whose deaths are still not confirmed, are believed to be elderly relatives who were trying to save their young family members from the wrath of angry male family members.

Meanwhile, Malik confirmed the arrest of three male suspects, all close relatives of he victims, and said he hoped for the arrest of a fourth accomplice "very soon."

About 50 per cent of the 170 million population of Pakistan are illiterate and honour killing by male relatives is rampant in countryside if they have even the slightest suspicion that their women have broken family nobility codes.

On Monday the Pakistani Senate (upper house) also called for action against those responsible for the killings.

An uproar was witnessed when women rights groups protested over alleged defence of the honour killings by some influential senators from the province. (dpa)