Militants on Tuesday released 11 Pakistani teachers involved in a polio vaccination campaign for school children which was conducted on November 23. According to political administrator, all the teachers were released by the militants after the efforts made by the administration. The teachers were taken from the private Hira Public School in the Bara area of the Khyber tribal agency, one of the semi autonomous tribal areas along border with the Afghanistan. The gunmen arrived just after teams administering the polio vaccines had left, officials said.