A student stands next to a sign, which originally read “Central Government Offices” and was modified to “Citizens’ Headquarters”, as riot police stand guard during a rally outside the government headquarters in Hong Kong

A student stands next to a sign, which originally read “Central Government Offices” and was modified to “Citizens’ Headquarters”, as riot police stand guard during a rally outside the government headquarters in Hong Kong

A student stands next to a sign, which originally read “Central Government Offices” and was modified to “Citizens’ Headquarters”, as riot police stand guard during a rally outside the government headquarters in Hong Kong September 28, 2014. Violent clashes between Hong Kong riot police and students galvanized tens of thousands of supporters for the city’s pro-democracy movement and kick-started a plan to lock down the heart of the Asian financial centre early on Sunday. REUTERS/Tyrone Siu (CHINA – Tags: POLITICS CIVIL UNREST EDUCATION TPX IMAGES OF THE DAY)