Students, teachers, parents and allies around the nation are preparing to “march for their lives” next month to rally for increased gun control and school safety measures.

The students at Marjory Stoneman Douglas High School in Parkland, Florida experienced tragedy. Seventeen people — classmates and teachers — were allegedly killed by 19-year-old Nikolas Cruz. Cruz was armed with an AR-15 rifle that he had legally purchased, authorities said.

But rather than wait for lawmakers to make a change, the survivors of the shooting are taking matters into their own hands – organizing, and taking action.

From their parents’ living rooms, Marjory Stoneman Douglas High School students are planning a march on Washington, D.C. called March for Our Lives.

Read more about March for Our Lives  by Sarah Gray at TIME