A roadside bomb explosion killed a Canadian soldier Friday, a Canadian military spokesman said. The explosion occurred during a joint Canadian-Afghan patrol in the Zhari district of Kandahar province, Navy Lt. John Nethercott said. Another Canadian soldier and an Afghan interpreter were injured. The death brings to 55 the number of US and NATO troops killed in Afghanistan this year. It also brings to 55 the number of Canadian troops who have died during the country's military mission in Afghanistan.