Hong Kong Protesters Hold Airport Rally after Violent Night.
VAUSE: Protesters in Hong Kong are planning a rally at the international airport after a night of violence, described by some of the worst violence during the three-months long unrest.</s>VAUSE (voice-over): Police and demonstrators clashed in a number of train stations Saturday with police using batons and tear gas to disperse the crowds; 40 people were arrested in one station alone before the authorities called criminal damages and illegal assembly.</s>WILL RIPLEY, CNN CORRESPONDENT: Just as Hong Kong police dispersed one demonstration, down the road that way, we walked this way and found this. I thought we were walking --</s>RIPLEY: -- up to some sort of a rock concert or Burning Man. There were laser beams. You hear cheers from the crowd of possibly thousands of protesters behind this barricade of fire that they have set up in the heart of Hong Kong, one of Hong Kong's busiest streets here in Wan Chai, shut down by protesters, who burned an umbrella. They set up barricades. And obviously there was enough propellant there because this fire's been going on for quite some time. We have seen protesters use their usual tactics today, although this is one of the more dramatic things that we've seen. They've thrown bricks at police. They have hurled petrol bombs at officers. And officers have fired back. OK. Not sure what that was but we'll just get a little bit further back from the fire there. Police officers have used tear gas, something that's been a mainstay this summer, and they have also been using water cannons, shooting out water with blue dye to try to identify the protesters who might get sprayed with the water because, keep in mind, all of these gatherings here are illegal. Hong Kong police did not give a permit. Demonstrators came out anyway. Smaller numbers, not the families that we saw out at the park. These are the people who are out here ready to fight. And that's exactly what they're doing here on the streets of Hong Kong. I'm Will Ripley for CNN.</s>VAUSE: With that we'll take you to a break. You're watching CNN.