Update:

The army official killed in Afghanistan has been identified as Major General Harold Greene.

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A two-star major general in the U.S. Army was killed on Tuesday when a man dressed as an Afghan soldier opened fire on a military training base in Kabul, Afghanistan, officials have said.

The officer is the highest-ranking member of the military to be killed in the Afghanistan war.

Officials told the New York Times that an unspecified number of other U.S. service members and foreign troops were also shot. Their conditions have been reported as critical by various anonymous sources. According to CBS News, 16 of the wounded are Americans, and three senior Afghan officers, including the camp's commander Gen. Gulam Sakhi, were wounded as well. A German brigadier general is also being treated for injuries, although the German military has said that they are not life-threatening.

The shooting was described by the American-led coalition as "an incident" at the Afghanistan National Military Academy, part of the Marshall Fahim National Defense University in Kabul, where a number of senior NATO commanders were meeting at the time.

Details are still unclear about the event and the shooter. The Afghan Defense Ministry said the shooter, who was killed by security forces at the base, was "a terrorist in an army uniform." However, the German military told the Times that the incident was "presumably an internal attack." Neither allegation has been confirmed.

So-called "insider attacks," where Afghan soldiers open fire on coalition forces, have sharply declined since 2012. Although the Taliban has often claimed credit for similar shootings, commanders from the U.S. and Afghanistan have said they are more likely a result of individual soldiers who have grown angry over the war and the continued foreign military presence in their country, the Times reports.

Other details will be released pending the general's family being notified of his death.