A U.S. soldier was injured in eastern Afghanistan on Wednesday when the military vehicle he was traveling in struck a land-mine, the U.S. military said.

The soldier was patrolling near the eastern city of Gardez when the incident occurred. The soldier was taken to an American base farther east in Khost and treated there.

The soldier's right foot was blown off by the explosion, the military said in a statement from Bagram Air Base, north of the capital, Kabul.

"He is in currently undergoing surgery at the forward operating base in Khost and is in stable condition," the statement said.

The statement did not identify the soldier or his unit.

Meanwhile, a lone gunman opened fire on U.S. Special Forces in Urgun in eastern Afghanistan, military spokeswoman Capt. Alayne Cramer said at Bagram. No one was hurt, but Urgun has been a particularly tense area for special forces operating there, who have faced regular attacks. Usually the gunmen, who operate in small groups, flee the area, often into neighboring Pakistan.

There have been reports from former Taliban that fresh training camps have been set up in the mountainous Urgun area of Paktika province. The camps are small and mobile, they say. The United Nations also confirmed reports of new training camps in eastern Afghanistan.

The military was also investigating the origins of two explosions that rattled the area outside a U.S. military compound in northern Kunduz province late Tuesday. No one was hurt in the blasts.