More Afghan civilians killed

Just a day after a US brigade commander offered an apology for the killing of civilians in Afghanistan's Nangahar province ("a terrible, terrible mistake,")

Airstrikes called in by U.S. Special Forces soldiers fighting with insurgents in southern Afghanistan killed at least 21 civilians, officials said Wednesday. One coalition soldier was also killed.

The killing of civilians is becoming a top issue in Afghanistan and is now undermining US efforts there.

The problem is, that with the relatively small number of US forces in their sector of Afghanistan, airstrikes are a necessary tactical requirement.