By Brenda Goh and Martin Quin Pollard SHANGHAI/BEIJING (Reuters) – People in the Chinese manufacturing hub of Guangzhou clashed with white hazmat-suited riot police on Tuesday night, online videos showed, the latest in a string of protests that escalated over the weekend over stringent COVID-19 lockdowns. The clashes, which follow protests in Shanghai, Beijing and elsewhere, erupted as China posts record numbers of COVID cases daily and health officials, including in the southern region around Guangzhou, announced a slight loosening of the curbs. Mainland China’s biggest wave of civil disobedi…