Roadside bombs ‘No. 1 threat’ to troops in Afghanistan

Insurgents’ use of roadside bombs has increased dramatically in Afghanistan this year, according to Pentagon statistics, and the United States’ top military official is calling them the "No. 1 threat" to troops there. In June there were 736 incidents in Afghanistan involving roadside bombs, called improvised explosive devices or IEDs, and 82 “effective attacks,” ones that caused casualties among coalition forces, the figures show.