CNN —China’s vast security apparatus has moved swiftly to smother mass protests that swept the country, with police patrolling streets, checking cell phones and even calling some demonstrators to warn them against a repeat. While protests over local grievances do occur in China, the current wave of demonstrations is the most widespread since the Tiananmen Square pro-democracy movement of 1989. Some of the boldest protests took place in Shanghai, where crowds called for Xi’s removal two nights in a row. Police cars patrol Shanghai's Urumqi Road, which has been completely blocked off by tall barricades after a weekend of protests. Another Shanghai protester told CNN they were among “around 80 to 110” people detained by police on Saturday night, adding they were released 24 hours later.

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