The chaos gripping Hong Kong reached a whole new level on Tuesday.<br />A teenager was shot by police during massive city-wide protests as China marked 70 years of Communist rule.<br />The protesters hit the streets, defying a police ban on demonstrations on the anniversary.<br />For more on this and other news around the world, let's turn to our Kim Da-mi.<br />Da-mi, tell us more.<br />Right Mark, what the world saw on Tuesday marked a dramatic escalation in violence with severe unrest to multiple areas of Hong Kong.<br />Police said an 18-year-old student was shot in the shoulder in the New Territories with a live round.<br />Even after a surgery, the teen activist is still in critical condition.<br />Police have thrown bean bags and fired live rounds into the air,...but this is the first time a protester has been hit by live ammunition during the four months of increasing chaotic demonstrations.<br />Describing the protesters as "rioters," Hong Kong police chief Stephen Lo said the firing of live rounds was "lawful and reasonable."<br />The young activist was just one of the 51 people who were injured on Tuesday night.<br />Tens of thousands marched through streets of Hong Kong, including in Causeway Bay towards government headquarters in Admiralty.<br />Districts across the semi-autonomous city quickly turned into battlefields,...as police fired tear gas in at least 6 locations and used water cannons.<br />Anti-China sentiment was stronger than ever,...with protesters chanting "Freedom for Hong Kong" and even burning portraits of Chinese leader Xi Jinping and Hong Kong Chief Executive Carrie Lam.<br />Over 180 demonstrators were arrested, the most in a single day since the unrest began in June.<br />