At least 14 high schoolers and one adult have been transported to two hospitals in Manitoba, where mass-casualty emergency codes were issued Tuesday after a bus near the northwestern town of Swan River rolled over amidst icy weather conditions.RCMP said in a statement that at least four passengers from the school bus are being treated for significant but non-life-threatening injuries. Around 8:35 a.m. on Tuesday, local police detachments were first alerted about the bus flipping over roughly 13 kilometres south of Mafeking, Man., where it was travelling on a provincial highway.