At least 70 students and teachers at an all girls school in Kabul, Afghanistan's capital, have been sickened by an unknown gas that spread through classrooms.<br /><br />School authorities evacuated everyone from the building and many of the girls were taken to hospitals.<br /><br />It is still not clear who is behind the incident, but there is suspicion that the Taliban, who has opposed sending girls to schools, is responsible.<br /><br />Hoda Abdel-Hamid reports from Kabul on what has become a part of a pattern of attacks on schoolgirls in the country.<br /><br />[August 25, 2010]