melanie on the phone with us explaining exactly how this arrest went down. mary kay, we appreciate your reporting and we'll stay in touch with you and pamela brown, as well, ascontinue to follow this story. thank you. >>> it is estimated that more than 300,000 people have been killed in syria's five-year civil war. entire neighborhoods and cities have been reduced to rubble. but a team of volunteers is risking their lives to try to save those in need. dr. sanjay gupta has this exclusive report. >> reporter: you're watching an extraordinary rescue in allepo city. for 12 hours, these men have been digging and drilling. and we're about to save the life of a 2-week-old baby. the baby, known only by the iconic protective gear they wear on their heads. in an area of the world burst, too many men in black hats, they are the cavalry, the white helmets. >> they have all chosen, they have all chosen to risk their lives to save others. and that makes every single one of them a hero. >> james lemeasrure is the architect of the organization. >> in syria, there is no 911 system. there is nobody that you can call. you can't pick up a phone and call the fire service. you ca