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 fallujah was the headquarters of the iraqi terror machine. we leave the former isis headquarters of fallujah and return to baghdad. a memorial for the victims now stands in karada, at the site of the explosion. amar al-darraji shows his brother-in-law the devastating impact of the detonation. the al-leif department store, once very popular and crowded, is now in ruins. in the blink of an eye, the lives of both men turned into a nightmare. shortly after 1:00 a.m. local time on july 3, germ