Afghan soldier attacks foreign soldiers, wounding 4

Several U.S. soldiers have been wounded and at least one Afghan soldier was killed Saturday in an incident that's being investigated as a possible "insider attack" on a military base in Afghanistan, officials confirmed to NBC News. It was the second such insider attack by an Afghan soldier in the past week.

A coalition official told CNN that some U.S. military personnel were wounded and evacuated after what appears to be an insider or "green-on-blue" attack by an Afghan soldier.

So far this year, six USA service members have been killed in combat in Afghanistan, all in Nangarhar in the eastern part of the country, according to statistics compiled by the website icasualties.org.

The Taliban in a statement did not say if they were directly behind the attack, only crediting a "patriotic Afghan soldier" for the assault.

The attack on Saturday took place at the Afghan National Army's 209th Corps headquarters in the province of Balkh, located some 540 km to the northwest of Kabul.

North Atlantic Treaty Organisation said an investigation into the incident has been launched. "Insider attack Camp Shaheen, Mazar-e Sharif under investigation". The attackers were disguised in Afghan army uniforms.

According to the Long War Journal, the total number of Coalition deaths from green-on-blue attacks since January 1, 2008 is 152.

An Afghan commando shot dead three USA soldiers last Saturday in eastern Nangarhar province.

United States troops are also at risk in other parts of Afghanistan.

The Pentagon is weighing the possibility of sending thousands more troops to the country to train Afghan forces to break what Lt. Gen. John Nicholson calls a stalemate there. "We only have reports of injured foreign troops", said Muhammad Radmanish, the ministry's spokesman.

U.S. troops in Afghanistan now number about 8,400, with another 5,000 from North Atlantic Treaty Organisation allies, who mainly serve in a training and advisory capacity.

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