The white Chicago policeman charged with murdering a black teenager he shot 16 times spent his first full day in custody on Wednesday in a jail hospital ward, as calm prevailed in a city braced for civil unrest over new video footage of the slaying.

Protests were mostly small and peaceful on Tuesday and Wednesday following the release of a graphic clip showing 17-year-old Laquan McDonald being gunned down in the middle of a street on Oct. 20, 2014, as he was walking away from police who had confronted him.

The tape, recorded from a dashboard-mounted camera in one of several patrol cars arriving on the scene, was made public on Tuesday under court order hours after the officer who fired the fatal volley of gunshots, Jason Van Dyke, was charged with first-degree murder.