the militant locks on his target and confidently fires. the missile streaks toward its target reportedly an egyptian military helicopter in the sinai region over the weekend. within seconds, just beyond that contrail, there's a puff of smoke. soon you see the aircraft on fire plummeting to the ground. the egyptian military says five soldiers were killed. the group which posted this video claimed responsibility. a u.s. official says the group has ties to al qaeda and, quote, is emerging as one of the most dangerous terrorist outfits in egypt. >> this person knew what he was doing. >> reporter: she says the missile used is a heat-seeking shoulder-fired missile that's a hot seller on the black market in the middle east. he believes that sa-7 and others like it came from libya. he was there during the libyan civil war and said he saw