China tightens security following protests against COVID curbs Police patrolled Monday the scene of weekend protests in Shanghai, Beijing and other cities in China after people demonstrated against strict COVID-19 measures that disrupted lives three years ago during the pandemic. Protesters have demonstrated in unprecedented numbers since Xi Jinping's inauguration a decade ago, from the streets of many Chinese cities to dozens upon universities. During his tenure, Xi oversaw the quashing and expansion of a high tech social surveillance system, which has made protest more difficult and riskier. Jason Sun, a student at a Shanghai college, said that he objects…