Pakistani military officials have dismissed as fabricated a video purporting to show a firing squad of uniformed soldiers shooting dead young men who were blindfolded and bound.

Its authenticity cannot be verified. It is unclear when or where it was filmed.

Human rights groups say they have previously documented extra-judicial killings by Pakistani troops but cannot vouch for the video.

The Pakistani military says it is investigating the footage.

"No Pakistani Army soldier or officer has been involved in activity of this sort," army spokesman Maj Gen Athar Abbas told the BBC.