Rangers have requested the Ministry of Interior to get documents of suspicious prisoners verified through National Database and Registration Authority (Nadra).
According to Nadra sources, surprising details have been unearthed about four of the prisoners.
Sources told that documents of these prisoners do not match with the record in jail. It is suspected that four of the prisoners have been released while some impostors are incarcerated to serve the remaining term in place of actual criminals.
Interior Ministry has also ordered Sindh Rangers to probe the matter.