Pakistani prisoner Sanaullah, who was injured in a scuffle with another inmate in a Jammu jail, on Sunday remained critical at the Post Graduate Institute of Medical Education and Research (PGIMER) here.
According to television reports, the prisoner is on ventilator and in deep coma.
Sanaullah was airlifted from Jammu to the PGIMER on Friday evening.
Pakistan High Commission officials visited Sanaullah at PGIMER on Saturday after India granted consular access to them.
Sanaullah was injured during a scuffle with another inmate in Jammu jail earlier on Friday morning where he was serving life term after being convicted under TADA provisions.
He was arrested in 1999. A resident of Sialkot in Pakistan, Sanaullah was immediately shifted from the high-security Kot Bhalwal jail to Government Medical College Hospital, and later rushed to PGIMER in Chandigarh in an air ambulance after doctors said his condition was critical.
The incident involving Sanaullah came a day after the death of Indian prisoner Sarabjit Singh, who was brutally attacked on April 26 by six Pakistani inmates in Lahore's Kot Lakhpat Jail.