HANGU (Online) - Five persons were killed while two others suffered critical injuries after a mentally retarded man opened fire at them Wednesday morning. The injured have been shifted to hospital where chances of their survival are said to be bleak, reported a private TV channel. According to DSP Tal Mir Chaman, a mentally handicapped man targeted the victims in a compound at Dar Samand area, killing five persons on the spot and leaving another two seriously injured. The police started a search for the accused after he managed to flee the crime scene. It has also been warned that he can prove more dangerous for public at large.