NATO restricts Afghan operations after 'green-on-blue' killings, anti-Islam film U.S. defense secretary: The Taliban are committing inside attacks as a "last-gasp" effort A U.S. commander estimated Taliban infiltrators are behind about a quarter of those (CNN) -- NATO troops in Afghanistan have been ordered to halt some joint operations with Afghan security forces after a spate of attacks by their local allies and amid fallout from a controversial anti-Islam video. "In response to an increased threat situation as a result of the 'Innocence of Muslims' video, plus the recent insider attacks, ISAF forces are increasing their vigilance and carefully reviewing all activities and interactions with the local population," Maj. Lori Hodge, a spokeswoman for NATO's International Security Assistance Force, said Tuesday. 4 NATO troops killed in 'insider' attack The U.S. government has condemned the video, which spurred deadly protests in several countries -- including Afghanistan. On Tuesday, for example, an insurgent group carried out a suicide attack that killed 12 people, including eight foreigners in Kabul, saying it was in response to the film. The other factor behind the partial joint operations suspension is the number of so-called "green-on-blue" attacks in the country. More: Why asylum seekers are fleeing Afghanistan "While some partnered operations are temporarily suspended, many continue -- and regional commanders have the authority to approve more," Pentagon press secretary George Little said. In addition, insurgents disguised in U.S. Army uniforms launched a coordinated assault Friday at the joint American-British base Camp Bastion, raising concerns that the attackers had inside knowledge. That attack killed two U.S. marines and destroyed six AV-8B Harrier jets, international forces said. Camp Bastion is also where Britain's Prince Harry is based. Harry was taken to a secure position after the perimeter at Bastion had been breached, British Defense Secretary Philip Hammond told BBC. How insurgents entered Prince Harry's base U.S. Defense Secretary Leon Panetta said Monday he is "very concerned" about insider attacks. "This is an approach that the Taliban is resorting to, similar to the use of (improvised explosive devices)," Panetta said. We think, very frankly, that it is kind of a last-gasp effort to be able to not only target our forces but to try to create chaos because they have been unable to regain any of the territory that they have lost. The halt in some joint operations with Afghan forces comes weeks after U.S. Special Operations forces suspended the training of some Afghan Local Police recruits while it double-checks the background of the current police force. It's unclear what impact, if any, the earlier suspension in training and the temporary halt of some joint operations will have on the timetable to withdraw. U.S. facing growing 'green-on-blue' challenge More: NATO admits killing civilians in strike CNN's Masoud Popalzai, Alexander Felton and Chelsea J. Carter contributed to this report.