KHANPUR- Twenty children were injured when a school van fell into a ravine in Khanpur today.Rescue sources told that the unfortunate van plunged into a ravine due to over speeding in Khanpur that wounded twenty school-going children out of which five were said to be in critical condition.Seventeen injured children were shifted to Tehsil Headquarter Hospital, Taxila, two children were transferred to PIMS Hospital, Islamabad due to their serious condition while one was brought to Margalla Hospital, Taxila.