Seven people including two security personnel and the attacker were killed as a suicide bomber detonated his explosive-laden car on a military convoy in the restive Sangin district of Helmand province on Tuesday, provincial governmental spokesman Omar Zawak said.

"A terrorist riding an explosive-borne car blew it up next to a military convoy in Sangin district at around 2:00 p.m. local time today killing himself and six others including two security personnel and four civilian passersby," Zawak told Xinhua.

Seven more persons including four security personnel and three more civilians sustained injuries in the violent attack, said the official.

Sangin district is branded as Taliban stronghold among other regions in the southern provinces of Helmand, Kandahar and Zabul where militants remain active.

To overcome militancy and ensure law and order, the government forces launched major operations in the restive Sangin district some two months ago and since then fierce fighting has been continuing between Afghan national security forces and Taliban militants there.

Ensuring security in Sangin district would enable government forces to curb militancy in poppy growing Helmand province and the whole troubled southern region.

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