The U.S. says "several" service members have been wounded in an explosion at a joint U.S.-Afghan outpost near the Pakistani border.
An Afghan official said a suicide bomber wearing an Afghan border policeman's uniform blew himself up at the U.S. base Thursday.
The spokesman for Paktia province, Roullah Samoun, said five Americans were wounded.
Samoun said the attack occurred after sundown in a barracks at a U.S. facility in the Dand aw Patan district in eastern Afghanistan, about 35 miles (70 kilometers) east of Gardez.
He did not identify the base by name or say what kind personnel are stationed there. The U.S. statement did not give details.
A U.S. spokesman, Lt. Col. Todd Vician, says U.S. officials have a report that some Americans were wounded in an incident, but he had no further details.
On Dec. 30 a Jordanian believed to be a double agent blew himself up at a CIA base in another border province, Khost, killing seven agency employees and a Jordanian intelligence officer.
The attack reported Thursday occurred about 400 miles (640 kilometers) northeast of the Taliban town of Marjah, which is under siege by U.S. and Afghan troops.
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