School shooting memorial set up at Marjory Stoneman Douglas High School

PARKLAND, FL - FEBRUARY 28: Broward County Sheriff officers welcome students as they arrive at Marjory Stoneman Douglas High School as students arrive to attend classes for the first time since the shooting that killed 17 people on February 14 at the school on February 28, 2018 in Parkland, Florida. Police arrested 19-year-old former student Nikolas Cruz for the 17 murders. (Photo by Joe Raedle/Getty Images)