(CNN) Exactly three weeks after he stalked the halls of his former high school, shooting and killing students and teachers alike, Nikolas Cruz was indicted on 34 counts of premeditated murder and attempted murder in connection with the rampage that left 17 people dead at Marjory Stoneman Douglas High School.

A Broward County grand jury charged the 19-year-old Florida gunman on Wednesday with 17 counts of premeditated murder in the first degree and 17 counts of attempted murder in the first degree.

The indictment came as students at the school returned for the first full day of classes since the carnage.

In a span of about 10 minutes, Cruz roamed the halls and targeted people huddled in classrooms on the first and second floors before leaving the campus undetected in a crowd of students.

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