Coalition forces in Afghanistan said they were investigating if friendly fire had caused casualties during a clash with suspected Taliban last week in which a Canadian and a US soldier died. Five soldiers — one US, one Afghan and three Canadian — were also wounded in the March 29 battle that erupted in volatile southern Helmand province after one of the biggest attacks on a coalition base in months. The US-led coalition had decided an investigation was warranted after reviewing reports of the attack, it said in a statement. Full Story