beginning with violence in a place better known for ancient ruins, cobalt seas, and american allies. turkey. it has exploded into fire and tear gas tonight. this is a green revolution of an entirely different sort. because it started as a protest over green space. parks that were disappearing. but it has devolved into so much more. you might say a vote of no confidence by turkey's people towards its long-standing prime minister. look at the scene. riot police moved in on tens of thousand of protesters in istanbul's taksim square. the scene, a volley of stun grenades, firecrackers, water cannons, and tear gas. it got so bad, cnn's arwa damon was overcome by gas as she was trying to report live. >> we're right now in the very front of the park. you can see people trying to help us out because of the tear gas. the entire front part of the park right now has been cleared out. because of the intensity of what was just fired in. >> we are just learning they have been tear gassed again. you saw peppermint being sprayed into arwa's eyes. the cnn crew trying to help her so she could continue