The Taliban say they carried out a suicide bombing inside a U.S.-Afghan base in eastern Afghanistan that killed two NATO service members.

A Taliban spokesman says an operative wearing an Afghan police uniform infiltrated the base last night and detonated his explosive vest next to a group of soldiers who were warming their hands beside a fire.

Local officials said they only knew of U.S. soldiers and Afghan border police on the base. A NATO statement on the attack confirmed that two of its service members died but did not give their nationalities. A number of others were wounded in the attack.

The attack was a reminder of the increasing sophistication and reach of insurgents. They have expanded attacks against targets like the capital and heavily guarded military outposts.