One U.S. military helicopter pilot was killed and another was injured in a training accident in Kuwait, the American military said Saturday.

The accident involving the AH-64 Apache (search) pilots occurred Friday afternoon northwest of Kuwait City, the military said in a statement.

The statement did not provide details about how the accident happened, saying only that it was under investigation.

The injured soldier was evacuated to a U.S. military hospital and was in stable condition, it said.

The identities of the soldiers were withheld pending notification of their families.

The soldiers' unit is in Kuwait as part of military operations in Iraq.

Kuwait (search) was the launch pad for the war and it is still a major logistics stop for American troops serving in Iraq.

The oil-rich state has been an ally of Washington since the 1991 U.S.-led Gulf War that liberated the country from a seven-month Iraqi occupation under Saddam Hussein (search).