The Taliban has claimed responsibility for what officials are calling a "large" explosion on a U.S.-led coalition base outside of Khost, the capital of Khost province in eastern Afghanistan.
There was no information about causalities in the explosion, which occurred early on Friday afternoon.
NATO confirmed that insurgents had attacked a coalition base in the east, but did not disclose the location of the attack.
Provincial police chief Gen. Sardar Mohammad Zazai says a very strong blast occurred at a base about 5 kilometers (3 miles) outside Khost.
Gen. Gula Jan, an Afghan police official who is at the scene, says it occurred at Camp Salerno. Jan says six civilians have been wounded.