<sod >David Cameron expressed his sympathy on Twitter, calling the targeting of a school "horrifying" and "deeply shocking" and Pakistani Prime Minister Nawaz Sharif is on his way to the scene of the attack.< eod>< sod > â¢ David Cameron expressed his sympathy on Twitter, calling the targeting of a school "horrifying" and "deeply shocking" and political leaders around the world have condemned the massacre.< eod>