India, Dec. 1 -- Amid the speculations regarding former Pakistani prime minister Imran Khan's health, his sons continue to demand for 'proof of life' of their father.

In a fresh statement, Kasim Khan has stated that his family is fearing that 'something irreversible' may have happened to the PTI leader. He added that amid the rumours, no verifiable contact has been made with the jailed leader, despite a court order which allows weekly meetings.

"Not knowing whether your father is safe, injured or even alive is a form of psychological torture," he said in written remarks, reported by Reuters. Kasim added that there has been no independently confirmed communication for a couple of months.

"Today we have no verifiable information at all a...