The Human Rights Commission of Pakistan (HRCP) asked the security agencies to share details of their operation in Kalat district of Balochistan where reports of civilian casualties are emerging.
"HRCP has noted with concern reports of an operation launched by the Frontier Corps in Johan area of Kalat, where civilian casualties have allegedly occurred," the commission said.
"A spokesperson for the security forces has claimed that 20 militants have been killed in an operation against terrorists. It is not clear if there are any casualties among the security forces," it said.
"It is vital that these disturbing reports are investigated without delay and details shared with the media and people. In particular, details such as the objective of the operation and the individuals and groups being targeted need to be made public," the commission said.
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"It is also important that the names, number and whereabouts of any individuals detained should be made public and due process ensured," it added.
The Balochistan province, rich in natural resources and gas has been hit by a spate of separatist and sectarian violence in recent years while militants of banned outfits have also carried out attacks on security forces and installations.