everybody, including china. i hope it works out peacefully. hope nobody gets hurt. i hope nobody gets killed. >> dana: senior foreign affairs correspondent greg palkot has more. >> reporter: we have been tracking this for several hours now. it is 2 a.m. in hong kong as we speak. the international airport seems to be calm. the protesters have left. security has left. it was anything but that earlier in the day. second day in a row protesters stage a sit in, virtually shutting down one of the world's busiest airports, blocking check-in, security areas. after some 200 flights were blocked yesterday, over 100 were affected today. but the real trouble broke out when angry protesters turned on at least one, maybe two people they thought were working with the chinese. that triggered the riot police. they came in fully armed, banging into the crowd, and the crowd fought back. several people were injured on either side. some activists were taken away.