Jail Superintendent Kulwant Sidhu was allegedly hit on the head with a brick by an inmate, leaving him unconscious.

He is under treatment at a private hospital.

Jail DSP Jagjeet Singh, a station house officer, and at least 2 CRPF personnel were also injured in the incident, and so were some of the inmates.

The situation has been brought under control, an official said.

ACP (East) Sumit Sood said a case has been registered, and an investigation is on into what exactly transpired.

The incident last night was brought to the notice of Punjab Jail Minister Laljit Singh Bhullar, who has sought a detailed report from the prison authorities, the source said.

On Tuesday, Police Commissioner Swapan Sharma arrived at the jail with a heavy police force to restore law and order.

In 2019, the same jail witnessed a major clash between the inmates.