as caroline milone explains people who report involved in the fighting are suffering at the hands of military rebel groups and isil. >> reporter: there is no doubt that millions of people have been affected by the war in syria. some of them hit by barrel bomb attacks launched by government. a recent u.n. report says there has been such an attack on aleppo nearly every day this year. rebel groups have used weapons in residential areas that also kill people indies crit family. the report also says the military and rebel groups have put people under siege by blocking off their access to foot dispood other sensual surprise. the u.n. gathered evidence from 4,000 witnesses and has compiled a confidence shall list of perpetrateers. >> in this very devastator conflict we advocate the need to stop the use of various weapons particularly barrel bombs which are being dropped particularly by government authorities. on the other front, of course, the nonstage or nongovernment armed groups are also using weapons illegally and indiscriminately in terms of attacking civilians such as mortars or bomb