Cruz, 19, allegedly opened fire at Marjory Stoneman Douglas High School in Parkland on February 14, killing 17 people and injuring others.
Cruz is charged with 17 counts of murder and could face the death penalty.
The attempted murder charges relate to those wounded in the attack, state attorney Michael Satz said in a statement.
Education Secretary Betsy DeVos to visit Douglas High School
The Safe-Way Bus Company has donated a bus to the school district so they can attend the march in St. We're here to stay until we see the policy changes we're demanding".
This is a developing story. His office has historically sought grand jury findings before deciding on death penalty cases.
James and Kimberly Snead, who took in Cruz after his mother died, were questioned for an hour Wednesday morning by the grand jury. Police said before Cruz was captured he stopped at a Subway for a drink, then sat down at a McDonald's restaurant.
Court documents reveal Cruz, 19, is kept in solitary confinement at Broward County Jail for his own safety, and that he appears to be enjoying himself while in confinement. That gunman, Nikolas Cruz, was arrested after the massacre, and according to the New York Post, he has been "smiling and giggling" in jail on some days and has also been restless at night.
The public defender representing Cruz has said the teen will plead guilty if prosecutors agree to not pursue the death penalty. "Various folks have been subpoenaed to come and to give testimony", said attorney Jim Lewis.
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Visits with Cruz appear to be limited, with only one unidentified family member meeting him at the jail. Democrats' efforts failed Tuesday to strip the bill of language that would create a program to arm some teachers and school employees who complete law enforcement training.
Students mourn at a community prayer vigil for victims of the shooting at Marjory Stoneman Douglas High School in Parkland, Florida.
Meanwhile, the Sun Sentinel reported a second student injured in the shooting has filed a letter of intent to sue the Broward Sheriff's Office, the school system and others.
The Florida legislature, in the wake of the shooting, is considering several gun-related measures. After a two week recess, the school has finally reopened its doors.
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