the wheels on the bus are not coming off. he was refering to the president's strategy in afghanistan. jon: so what about attacks on american trainers. has the numbers spiked as a result of koran burning? or roughly the same as previous years? >> reporter: well it is very interesting, since 2007 afghan security forces turned their guns on american and european partners 61 times, killing 70 troops and injuring over 100. 12 nato troops have been murdered by afghan troops this year alone. these acts of betrayal accounted for 20% of all troops deaths in afghanistan in 2012. the six american deaths in the last two weeks are apparently revenge killings for the koran burning incident but it is not the first time the afghans have turned on their nato trainers. u.s. trainers have now returned to at least one afghan ministry since the brutal killing at the interior ministry last weekend but they are not saying which ministry for