PHILADELPHIA (CBS) — Officials say shortly before 8 a.m. Monday, the family of Brandon Tate-Brown blocked the front door of the District Attorney’s Office at 3 Penn Square in Center City.

Demonstrators are calling for justice for Tate-Brown, who was killed in a police stop in Philadelphia last December.

This comes one day after violence broke out in Ferguson, a year to the day Michael Brown was shot and killed by police.