"The Punjab government has taken notice of it and an investigation is in process, that is all that I know that I'm in a position to convey to you and there should be no anxiety on this issue," he told reporters on the sidelines of a business event.
Singh died in mysterious conditions in a Pakistani jail. The preliminary report states that traces of four injuries were found on the body, including a fracture of the right knee, an abrasion of 1.5 cm to 2 cm on the left knee joint, an abrasion over the upper lip and scars on the thigh.
He was serving a five-year prison term at Kot Lakhpat Jail for alleged involvement in espionage.
Tehseen Khan, a Christian lawyer who recently completed a 42-month sentence for fraud at Kot Lakhpat Jail, claimed Singh died after being beaten by prison staff.