killed Parkland school shooting the 14 February massacre mass shooting at Marjory Stoneman Douglas High School shooting at Marjory Stoneman Douglas High The Guardian has left 17 people dead The Guardian school shooting in Parkland, Florida mass shooting Florida school shooting horrific school shooting Seventeen people The Guardian tragic recent events in Parkland, Florida horrific school shooting Guardian opened fire The Guardian opened fire The Guardian Seventeen people have been confirmed dead 17 people were killed 17 people opened fire who killed 17 people in a Florida high school Florida school shooting Marjory Stoneman Douglas High School carnage