Two undertrials in the high-security Tihar Jail in Delhi were killed when two groups of inmates clashed last evening. Talking to AIR, Additional Inspector General of Tihar Jail Mukesh Prasad said, one Deputy superintendent and seven other staff member of Tihar jail have also been injured. <br/><br/>He said, the prisoners involved in the clash are having multiple criminal cases against them. Prasad said, the exact reason of the clash will be known after an inquiry by jail authorities.