An Afghan soldier has opened fire on American troops, wounding at least seven of them, before being shot dead in a military base in northern Afghanistan, officials said, in the second so-called "insider attack" in the past week. A week earlier, a Taliban infiltrator killed three US troops in eastern Afghanistan.
The bulk of the extra forces will train and advise Afghan troops, the official said, while a smaller number would be assigned to counterterror operations against the Taliban and Islamic State (IS) extremists.
Afghanistan's Ministry of Defense also is investigating, said Abdul Qhahar Aram, head of strategic communication and public affairs for the 209 Shahin Corps.
NATO's Resolute Support later tweeted that seven US servicemembers were wounded and evacuated for treatment.
Three U.S. soldiers were killed in another "green-on-blue" attack a week ago during a U.S.
Earlier this month, the Taliban claimed responsibility for killing three USA soldiers in eastern Afghanistan.
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So-called green-on-blue, or insider, attacks have been a recurring problem for the USA -led coalition, most recently on June 10 in the Achin District of eastern Nangarhar province, where US ground forces are helping Afghan special forces fight Islamic State extremists. Afghan forces battled the Taliban team throughout the day before killing the last remaining attacker.
On 11 June, the Taliban claimed a similar operation in the east of the country: an Afghan soldier opened fire on U.S. troops killing three soldiers and wounding a fourth in an operation against insurgents in the eastern province.
With President Ashraf Ghani's government locked in internal division and amid weeks of protest by a group of people demanding his administration's resignation over rising unrest, the militants have stepped up and broadened their attacks recently. There has been no causality reported by the US Troops.
Taliban-led insurgency has been on the rampage since late April when the Taliban launched their annual rebel offensive and intensified attacks across the country.