Student advocates for gun control in wake of Florida shooting "This could have been stopped": Lorena Sanabrina was among the hundreds of Marjory Stoneman Douglas High School students who hid in their classrooms as Nicholas Cruz fired rounds of bullets throughout the school, killing 17 people. Now, just days after the shooting, the 11th grader has become an advocate for gun control, urging fellow students to "speak directly to the government and plead and beg" them to change gun laws in the US. IMAGES AND SOUNDBITES