News At Seven-Thirty highlights: an overnight curfew has been imposed in Urumqi; some tour groups from HK and Taiwan continue with their trips to Xinjiang; Guangdong authorities detained 15 people for clashes between ethnic Han and Uighur workers; Rebiya Kadeer denied involvement in the riots in Xinjiang; a mainland man was arrested for allegedly killing 4 of his HK relatives; Michael Jackson’s memorial will be broadcast around the world; Obama said U.S. and Russia do not have to be enemies; Honduran President have talks with Hillary Clinton; plastic bag levy came into effect today; Donald Tsang outlined plans to broaden and escalate campaign against youth drug abuse; Microsoft warned about a serious computer security vulnerability.