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They've lit a bunch of oil fires that also poison the air. they've used vehicle-borne improvised explosive devices and detonated them in iraqi areas. >> the government urges residents to remain in the city, over 90,000 fled there hell and earth under isis. aid reaches some of them through nongovernmental organizations or ngos, they aren't getting help from baghdad, everything, the food, the water, even the support for the soldiers protecting them is all coming from the regional government at kurdistan or ngos like the free kurdish rangers and samaritan's purse. >> there's 500 sets of boots and...

Oliver: humanitarian workers here are constantly threatened with attacks. shortly after our interview, isis militants open fire on dave and his team as they were handing out food in east mosul. gunshots sent terrified civilians running for cover. >> the iraqi army attacks and they're still somewhere out there. now we're back, isis is still there, we're back a little. oliver: the work being done by ngos is crucial as winter sets in. temperatures are dropping and conditions increasingly dire, there is a shortage of fuel and food in the city. as many as 650,000 people are left without water after...

Oliver: meet dave eubank, one of the american relief workers risking his life to help the refugees, he's a former special army rangers officer, they deliver aid and medical care to oppressed ethnic minorities in burma, sudan and now mosul. >> on the de facto border of kurdistan and iraq, and put the lines up as they're fighting isis on both sides. this line, they went back and cleared the villages, all the small towns in between and finally bashica. this is the place that they come, we can bring them food and water and they get vetted and searched and sheep get fed and move to refugee camp the...

Oliver: humanitarian workers here are constantly threatened with attacks. shortly after our interview, isis militants open fire on dave and his team as they were handing out food in east mosul. gunshots sent terrified civilians running for cover. >> the iraqi army attacks and they're still somewhere out there. now we're back, isis is still there, we're back a little. oliver: the work being done by ngos is crucial as winter sets in. temperatures are dropping and conditions increasingly dire, there is a shortage of fuel and food in the city. as many as 650,000 people are left without water after...