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At least 17 people were dead after a 19-year-old man opened fire at Marjory Stoneman Douglas High School in Parkland, Florida, on Wednesday afternoon, officials said, according to NBC News.

Fourteen others were wounded, five of whom had life-threatening injuries Wednesday night, hospital officials said. Authorities said the suspect, identified as Nikolas Cruz, concealed himself in the fleeing crowd and was arrested in nearby Coral Springs. He was treated for "labored breathing" as a precaution but was released from the hospital, they said.

The gunfire began outside the school and continued inside, where 12 of the victims were killed, Israel said. All of those victims have been identified, he said, but no identities will be made public until the families of all of those affected have been notified.

Federal and local authorities told NBC News that there was no indication that the gunman had an accomplice or accomplices.