Awwal 18, 1432, Feb 21, 2011, SPA -- A bus filled with teachers and their family members crashed in northern Thailand early Monday, killing 13 passengers and injuring 17 others, police said. The bus skidded off a mountain road and tumbled down a 100-metre ridge in Songkwae district in Nan province, Police Lieutenant Colonel Kiatthiyot Suwankhasri was quoted as saying by DPA.