Afghanistan, June 13 -- A total of 763 Afghan nationals were released from prisons in Pakistan and returned to Afghanistan over the past week, according to authorities overseeing migration affairs.

The Ministry of Refugees and Repatriation said on Saturday that the former detainees entered Afghanistan through the Torkham and Spin Boldak border crossings after completing legal procedures.

The releases come amid Pakistan's ongoing campaign against undocumented foreign nationals, which has led to the detention, deportation and voluntary return of hundreds of thousands of Afghans over the past two years. Pakistani authorities have repeatedly said that individuals without valid residency documents must leave the country.

The United Nations an...