One woman was killed and three others were injured, including a child, when their car hit a hidden roadside bomb in Afghanistan’s southern Helmand province on Wednesday, local officials said. The incident took place in the Marjeh district of Helmand on Wednesday morning when the civilian car struck the improvised explosive device (IED) hidden in the road, provincial spokesman Daoud Ahmadi said. No group, including the Taliban, has claimed responsibility for the blast. It comes five days after a similar incident in Helmand's Greshk district where four civilians were killed. Insurgents frequently hide improvised explosive devices on roads to target Afghan and Nato troops, but most of the victims are civilians.