New Delhi: Tihar Jail authorities have stepped up security at the facility and intensified frisking and other precautionary measures following the death of a fourth inmate within a fortnight at the prison.

A prisoner in the special security ward died after he was attacked yesterday with a sharp weapon by a fellow inmate.

The fatal attack by Promod on Salman in Cell No.5 led to the fourth case of death at Tihar in a fortnight and has now resulted in heightened vigil at the facility.

Two suicides and an accidental death have been reported at the jail over the last two weeks.

Taking a serious view of the matter, Director General, Delhi Prisons, Alok Verma, has ordered a high-level inquiry into the causes behind the lapses leading to such incidents.

Jail sources said that Salman and Promod had got into a fight on the day before the fatal attack and had inflicted serious injuries on each other following which both were sent to the DDU hospital for treatment.