A protester raises his umbrellas after riot police fire tear gas to disperse protesters in Hong Kong, September 28, 2014.ÊLarge-scale protests calling for a fully democratic vote to choose Hong Kong's next leader rocked the city for over two months in 2014. The so-called Occupy Central campaign was the most serious challenge to China's authority since the 1989 pro-democracy demonstrations and crackdown in Beijing's Tiananmen Square. Umbrellas became a symbol of the 2014 campaign as protesters used them to fend off police pepper spray attacks. REUTERS/Tyrone Siu/File photo SEARCH "HONGKONG TIMELINE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.