Afghan 'Soldier' Opens Fire On NATO Troops At Military Base; U.S. Soldier Killed

At least one U.S. soldier was killed and several NATO troops were wounded after an attacker dressed in an Afghan army uniform open fired on a military training base in Afghanistan.

The circumstances surrounding the Tuesday attack at the British-led Camp Qargha in the capital Kabul are not clear, the Associated Press reported. A person described as a "terrorist in an army uniform" fired a weapon on both Afghan and foreign troops before the attacker was shot and killed, said General Mohammad Zahir Azimi, a spokesperson for Afghanistan's Defense Ministry.

It is also not clear how many people have been killed. According to the AP, one U.S. soldier was killed and 15 NATO troops were wounded. Other accounts say three senior NATO officers were killed and several Afghan troops were wounded, The New York Times reported.

"About a dozen" Americans were among those wounded, a U.S. official told the AP on condition of anonymity.

The British Defense Ministry said they are looking into the shooting and that "it would be inappropriate to comment further at this time."

Tuesday's shooting is considered the first "insider" attack- when Afghan security officials open fire on coalition troops- to occur in Afghanistan in several months. In 2013 there 10 attacks, compared to the 38 that occurred in 2012, the AP reported.

Such attacks have been blamed on the Taliban as a way for the Islamic fundamentalist group to show the scope of their influence after its regime was dismantled over a decade ago. American and Afghan officials believe the attacks could be due to resentment Afghan soldiers feel towards the presence of foreign troops in the country, The NY Times reported.

Despite the fact that there have been fewer attacks, international troops remain at risk.

NATO confirmed the Tuesday incident and said it was "in the process of assessing the situation."