PARKLAND, FLA.—A former student opened fire at a Florida high school Wednesday, killing at least 17 people and sending scores of students fleeing into the streets in the nation’s deadliest school shooting since a gunman attacked an elementary school in Newtown, Conn.Frantic parents rushed to Marjory Stoneman Douglas High School to find SWAT team members and ambulances surrounding the campus as classes prepared to dismiss for the day. Live footage showed emergency workers who appeared to be treating the wounded on sidewalks.“It is a horrific situation,” said Robert Runcie, superintendent of the school district in Parkland, about an hour’s drive north of Miami. “It is a horrible day for us.”The 19-year-old suspect was taken into custody without a fight about an hour after he left the scene, authorities said.Broward County Sheriff Scott Israel said the suspect, who was previously expelled for disciplinary reasons, had at least one rifle and multiple magazines.“It’s catastrophic. There really are no words,” Israel said on Twitter.Most of the fatalities were inside the building, though some victims were found fatally shot outside, the sheriff said.Doctors say 16 people wounded in a deadly shooting at a Florida high school are being treated at area hospitals.Dr. Evan Boyar at Broward Health North told reporters Wednesday that eight victims and the suspect had been brought to his hospital. Boyar says two victims died, three were in critical condition and three were in stable condition. He says three patients were still in the operating room Wednesday evening. The suspect was treated and released to police.Boyar says all the victims were shot but declined to comment on their ages or the extent of their wounds.Eight other victims were taken to other hospitals, but he did not have information on their conditions.The gunman was identified as Nicolas Cruz by a U.S. official briefed on the investigation. The officia ...