BALTIMORE — Hundreds of Baltimore students have marched on City Hall to protest gun violence and call for stricter gun control legislation weeks after the Parkland, Florida, school shooting that left 17 dead.

The Baltimore Sun reports students from multiple high schools walked out of class Tuesday, chanting “Grades up! Guns down!” during a 5-mile (8-kilometer) march to the plaza outside City Hall, where Mayor Catherine E. Pugh and Police Commissioner Darryl De Sousa offered support.

Chants of "Grades up! Guns down!" as hundreds of Baltimore students protest gun violence during a school walkout. One girl just turned around, looked at the massive line of students and said to her friend: "Wow, that's all us." pic.twitter.com/kjTcMbrdl8

— Talia Richman (@TaliRichman) March 6, 2018

The students developed a code of conduct calling for a peaceful demonstration. They also compiled a list of demands, including gun control legislation and social work and counseling services in school.

Baltimore City school kids walk out. pic.twitter.com/gayw8KABL3

— Agnes Alston (@AgnesAlston54) March 6, 2018

The number of counselors in the Baltimore City school system has steeply declined, and the city saw a record number of homicides per-capita last year.