jasem mohammed mater: there's a battery inside the fuse. just a bit of pressure brings the metal strip into contact with the screws. the electrical current runs through, and the bomb explodes. reporter: the remains of isis's weapons arsenals are found throughout fallujah. and they are not old munitions like kalashnikovs, but modern precision-weapons. isis has many specialists working on their publicity, administration, logistics, vehicles, and scouting out potential targets. general abdel wahhab al-saidi: they supplied all of iraq from here. all of the terror attacks were carried out with explosives from fallujah. all the vehicles loaded with explosives were also from here. reporter: hundreds of explosive devices were produced here every day, often made with phosphate. to drastically increase the number of casualties, bomb-makers added metal fragments to the explosives, increasing their fatal radius. the army's anti-terror experts have found 50 weapons workshops in the city so far. and they believe there are more. our guide tells us that fa