Six suspected Taliban militants were killed when a landmine they were planting on a road exploded in the insurgency-hit southern province of Kandahar, Afghan officials said Sunday. The incident occurred on Saturday night in Maywand district, Kandahar police chief Abdul Malik Wahidi told AFP. Maywand administration chief Mohammad Nabi Idari said the men were planting the landmine on a road used by Afghan and US forces on patrol.Separately police said they had arrested three militants in neighbouring Dand district and charged them with planning suicide attacks. "Police arrested a man who was carrying a large amount of explosives on a motorcycle. He tipped the police about two others who were detained later," Wahidi said. He said police recovered four motorcycles, all fitted with explosives, from the suspects. The detainees are all Afghan nationals. "The suspects have confessed they were planning suicide attacks in the city," the police chief said.