EFPs use U.S. military : January increase in bombs believed linked to Iran . Devices are known as EFPs ( explosively formed penetrators ) . Petraeus : EFPs increased by a factor of two or three over last 10 days . Bush administration , military says , terrorists , and Iraqi insurgents .
U.S. military : January increase in bombs believed linked to Iran . Devices are known as EFPs ( explosively formed penetrators ) . Petraeus : EFPs increased by a factor of two or three over last 10 days . Bush administration , military says , terrorists , and Iraqi insurgents .