members of india's air force, vy, and national disaster response fce used helicopters, boats, and diving teams to rescue the trapped passengers. there were no juries reported, but monsoon flooding in south asia has killed more than 600 people in recent weeks for the latest developments on the protests in hong kong, visit pbs.org/newshour. >> sreenivasan: as we reported earlier, protesters were again out on the streets of hong kong today. amid the familiar scenes of tear gas, batons and covered faces, there's a new focus on the waye authorities ing technology to identify and track protesters. for more, "new york times" reporter paul mozur joins us now via skype from shanghai. spaul, it looks like ther almost a cat-and-mouse game using facial recognition on both sides. >> yeah, that's right. so basically, what we've seen is, as the protests have gone on and police and hong kongers continue to sq re off week after week, the face has become poaponized, and identity itself, in a way, is weazed. you know, protesters will go out and police will try to captureei images on video, and then go back