MARDAN, March 29: A low intensity bomb planted by suspected militants went off outside the Khyber Homoeopathic College in Sharifabad area here on Tuesday causing partial damage to the building.Officials of the bomb disposal unit told Dawn that the college was closed at the time of blast. They said that the explosion caused no casualties, however the main gate of college was partially damaged. The city police station has registered a case against unidentified militants and started investigation.