Kabul, Sha'ban 26, 1435, Jun 24, 2014, SPA -- At least two policemen were killed Tuesday in a grenade attack on their security checkpoint in western Afghanistan, police said. The incident occurred in Obe district at 11 am [0630 GMT], according to Abdul Raof Ahmadi, Herat provincial police spokesman. "Two armed men on a motorbike tossed a grenade at a police security checkpoint and fled the area," dpa quoted Ahmadi as saying. No group claimed immediate responsibility for the attack. --SPA 20:28 LOCAL TIME 17:28 GMT www.spa.gov.sa/w