Afghanistan ? A nighttime raid in eastern Afghanistan by U.S. and Afghan troops sparked a gunbattle that killed three people, including two children, and the military said Thursday it was investigating the deaths.

Civilian casualties have incited resentment and demonstrations against U.S. and NATO forces, though officials blame militants who use civilian homes as cover during clashes. President Hamid Karzai has pleaded with Western forces to do all they can to prevent such deaths.

The latest civilian casualties came as U.S. and Afghan troops raided a compound suspected of harboring militants belonging to a suicide bombing network. They were fired on as they approached late Wednesday in Bati Kot district in Nangarhar province, said Maj. Chris Belcher, a spokesman for the U.S.-led coalition.

After the clash, a militant and two children were found dead inside the compound, Belcher said. A woman and another child were wounded, he said.