 Complete the following phrase:  Many commentators expressed fears that the explosives had fallen into the hands of terrorists and would be used by the Iraqi insurgency to mount attacks against US and Iraqi troops. Many insurgent attacks have been carried out using improvised explosive devices made from military munitions, most often 122 mm artillery shells and landmines. IEDs made with high explosives are far more powerful and devastating and have been used in some of the most damaging attacks carried out in Iraq, such as the August 19, 2003 