A senior police officer in the restive¹ south-western Pakistani province of Balochistan has been shot dead by unidentified gunmen, officials say.

巴基斯坦一位高级警官在西南部动乱省份俾路支省被一名不明身份枪手射杀。

Shahnawaz Khan was gunned down outside his home in the Satellite Town area of Balochistan's capital, Quetta.

Balochistan is the centre of a nationalist insurgency²（叛乱） and there is also an active Taliban presence in the region.

No group has said it carried out this attack.

Mr Khan was a senior figure in Balochistan's Crimes Investigation³ Department and investigated cases of terror and sectarian（宗派的） violence, according to reports.

The killing⁴ is the latest in a number of targeted attacks on security forces in the region.

Last week a bomb attack targeted Pakistan's Frontier Corps⁵ in Quetta, killing at least two people and in February 11 Pakistani soldiers died in an attack by separatist rebels elsewhere in the province.