Hong Kong protesters chanting anti-government slogans trapped city leader Carrie Lam in a stadium for hours on Thursday after she held her first “open dialogue” with the people in a bid to end more than three months of often violent unrest.

Activists blocked roads and stood their ground despite police warnings, before beginning to disperse. More than four hours after the talks had ended, a convoy carrying Lam and other senior officials left the building under police guard.