KANDAHAR (AFP/Reuters) - Furious Afghan villagers protested in Kandahar on Wednesday by carrying the bodies of four brothers, three of them children, who they said were killed by US attack helicopters. More than 100 men arrived with the corpses from nearby Arghandab district, protesting that US forces trying to defeat a Taliban insurgency were killing the innocent and should leave Afghanistan. The US military confirmed it had carried out night strikes against militant targets and were investigating allegations that civilians were killed. The villagers showed reporters the bodies of three boys who looked to have been aged 10 to 13, and a man aged about 25 who they said was a civilian, an AFP correspondent said. Another child and a civilian man were hurt in the incident, village leader Hazrat Mohammad told reporters. Last night around 1:00 am helicopters shot nine rockets into a house and destroyed it, Mohammad said. The six casualties were all brothers, he said. The villagers, who arrived in about seven pick-up trucks, accused the US military of trying to capture Afghanistan, not help the Afghan people. NATO forces denied they had killed four civilians in the air strike. A spokesman for the NATO-led force in Kabul confirmed that the alliance had carried out an air strike in Kandahars Arghandab district overnight, but said those killed in the raid were militants, not civilians. He gave no details of the number of people killed or the circumstances of the strike. Separately, a roadside bomb ripped through a civilian vehicle in eastern Afghanistan and killed six men Wednesday, the provincial government said, in the latest attack in the run-up to elections. The bomb hit the group in Nangarhar province as they were travelling to meet district government officials, the provincial government spokesman said. Two of the killed are tribal elders and four of them are employees of a private Afghan construction company, Ahmad Zia Abdulzai told AFP.