Until now, officials had said the attacks seemed to stem either from personal grievances against the allies or from Taliban infiltration.
NATO`s head Rasmussen comments come as he conceded that the recent Taliban strategy of ‘green on blue’ killings.
In wake of surging Afghan insider attacks and growing anti-Western sentiments over an anti-Islam film, NATO on Tuesday decided to scale back its joint operations with Afghan forces.
Martin Dempsey said the Afghan government needs to take the problem as seriously as do US commanders and officials.
In the past, Iran and Pak spies have been accused of enabling Afghan insurgents to destabilise the country.
Day in Pics: 28th January
Showbiz World - January 28, 2015
President Barack Obama's speech at Siri Fort auditorium