Baltimore city schools CEO Gregory Thornton welcomed students back to Frederick Douglass High School, two days after some students engaged in an exchange with city police.

Baltimore city schools CEO Gregory Thornton welcomed students back to Frederick Douglass High School, two days after some students engaged in an exchange with city police.

Baltimore city schools CEO Gregory Thornton welcomed students back to Frederick Douglass High School, two days after some students engaged in an exchange with city police.

Baltimore city schools CEO Gregory Thornton welcomed students back to Frederick Douglass High School, two days after some students engaged in an exchange with city police.

Students back to Frederick Douglass High School, two days after some students engaged in an exchange with city police.

Protesters in traffic at Baltimore downtown Inner Harbor

Protesters in traffic at Baltimore Federal Hill location

Protesters in traffic at Baltimore Federal Hill location

Baltimore City Public Housing

Protesters passing through the University of Maryland Baltimore as they head to City Hall. They started marching midday Saturday from Sandtown in West Baltimore.