UN objections to Pakistani military courts and related legislation

The Nation reports here on correspondence it claims exclusively to have seen from UN human rights bodies faulting Pakistan's military courts and related legislation. According to this account:

The United Nations human rights (HR) bodies have expressed their grave concern over the establishment of military courts in Pakistan and other provisions of Protection of Pakistan Act (PoPA) under which the courts were set up to respond to security concerns in the country, The Nation has learnt through highly reliable sources. 

The UN bodies have observed that certain provisions of the legislation are not in line with Pakistan’s international human rights obligations under the treaties it has ratified and other international human rights and humanitarian standards. They said “such court (military courts) must be a different body from the one that ordered detention and that its competence, independence and impartiality should not be undermined by procedures or rules pertaining to the selection and appointment of judges.”