Police in Helmand said the attacker attended a police academy in Kandahar, southern Afghanistan, and had been working as an officer in the Nad-e-Ali area for three years.

赫尔曼德省的警察说，袭击者曾就读于阿富汗南部坎大哈（Kandahar）的一所警察学校，并在德阿里地区做了三年的警官。

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Until a few years ago, Nad Ali was a relatively peaceful district in the central Helmand river valley.

BBC: UK troops launch Operation Tor Shezada in Afghanistan

The initial offensive in Marjah, in Nad Ali district, began early on Saturday.

BBC: Afghanistan: Nato launches major anti-Taliban offensive

Walter Reid Barrie was shot and killed in Nad Ali district of Helmand Nov. 11, the last British soldier to die before Monday's incident.

NPR: Afghan Soldier Kills British Soldier, Wounds 6