Doctors treating Indian death row convict Sarbajit Singh, comatose in a hospital in Lahore, Pakistan after a brutal assault, today said his condition has deteriorated though he had not been declared brain dead.

Allama Iqbal Medical College principal Mahmood Shaukat, the head of a four-member medical board this is supervising Sarabjit's treatment, confirmed that his condition had deteriorated.

"He continues to be serious but has not been declared brain dead," Shaukat told PTI. "In our latest investigation, there was no sign of improvement (in Sarabjit's condition). Rather, his condition further deteriorated," he said.

Sarabjit is in a special intensive care unit of the state-run Jinnah Hospital. Shaukat said top neurosurgeons and physicians are providing Sarabjit the best treatment to save his life.

The doctors had changed some medications after the deterioration in his condition. A second CT scan on Sarabjit too did not reveal any signs of improvement, Shaukat said.