<sod >The school bus was carrying an unknown number of passengers when in collided head-on with a truck carrying construction materials at around 7.15am local time (6.15am GMT).< eod>< sod > The school bus was carrying 18 childrenÃÂÃÂ when in collided with a truck carrying construction materials at around 7.15am local time (6.15am GMT).< eod>