KABUL, July 28 (Xinhua) -- Eight security guards with a private security company were killed and four others sustained injures as their cars struck roadside bombs on Tuesday in Helmand province of southern Afghanistan, a statement of Interior Ministry issued here said.

    "It occurred at 8 a.m. this morning when two cars, belonging to Humayon Security Company, were struck by remote control mine in Yakhchal area of Grishik district, leaving eight guards dead and four others injured, all Afghans," it said.

    Moreover, it blamed the enemy of Afghanistan, a term used by official for Taliban insurgents, for carrying this gruesome incident.

    In another incident on the same day, Afghan National Army (ANA) killed one Taliban militant and wounded another as they came in contact with Taliban rebels in Helmand province, said a statement of Defense Ministry.

    "In continuation of operation Attal 41 (Hero 41) in Helmand province, a militant was killed and another wounded as they came in contact with ANA unit conducting searching operation around the Khanshin district," it added.

    It also said that one mortar installing on a vehicle was destroyed and two more with three shells were also found by ANA.

    A massive operation against Taliban militants, jointly launched by U.S. Marines and ANA, is going on in the restive Helmand province and over 80 militants have been killed since the operation launched on July 2.