Mrs. Lam has so far declined to engage the protesters on most of their other demands. She said on Wednesday that she would add two members to an existing police review board, but that was far short of calls for an independent investigation.

A primary locus of this weekend’s demonstrations has been Prince Edward Station in Mong Kok, where riot officers charged into a waiting train car during mass protests on Aug. 31, beating four people with batons and dousing them in pepper spray.

Protesters have been demanding to see security footage of that incident, but the authorities have so far refused to release any. When the authorities stopped train service to Prince Edward Station on Friday, some protesters broke into the station and vandalized it, along with the Mong Kok and Yau Ma Tei stations.

Saturday’s unrest began in the afternoon with sit-ins at several malls, and ended that night with the police deploying pepper spray against demonstrators in and around Mong Kok.