image sourceGetty Images image captionA wounded patient is brought by a taxi to the Emergency hospital in Kabul after the attacksSurvivors have spoken of their horror after twin blasts hit crowds of people awaiting evacuation outside Kabul's airport on Thursday.... image sourceEPA image captionThousands of people were waiting outside the airport when the attacks began" It was as if someone pulled the ground from under my feet.... The little water flowing into it had turned into blood," he reca