24 December 2012 Last updated at 02:04 ET
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An Afghan policewoman has killed a US military adviser at police headquarters in Kabul, Afghan officials say.
It is believed to be the first incident in which a female member of Afghanistan's security services has opened fire on a Nato soldier.
There has been a rise in incidents in which foreign troops have been killed by Afghan troops or policemen.
In September the US suspended training for local police recruits because of "insider attacks".
It said it was carrying out checks on whether recruits had links to the Taliban.
Training Afghan security forces is an essential part of Nato's strategy before foreign combat troops pull out in 2014.
Continue reading the main story
An Afghan policewoman has killed a US military adviser at police headquarters in Kabul, Afghan officials say.
It is believed to be the first incident in which a female member of Afghanistan's security services has opened fire on a Nato soldier.
There has been a rise in incidents in which foreign troops have been killed by Afghan troops or policemen.
In September the US suspended training for local police recruits because of "insider attacks".
It said it was carrying out checks on whether recruits had links to the Taliban.
Training Afghan security forces is an essential part of Nato's strategy before foreign combat troops pull out in 2014.