The charges are believed to be in connection with a July 6 protest and the July 21, 2019 mob attack by white-shirted thugs on train passengers at Yuen Long MTR station, during which Lam was attacked and injured. Police said they had arrested four people in connection with a dispute between bystanders and a man seen taking photos of protesters outside Tuen Mun police station, adding that someone had snatched away the man's phone and deleted the pictures during the incident.
Democratic Party chairman Wu Chi-wai said the arrests were a form of political retaliation amid ongoing police attempts to change the widely accepted narrative surrounding the July 21 attacks in Yuen Long.