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The half-brother of Nikolas Cruz, who is charged with killing 17 people at Marjory Stoneman Douglas High School in Florida on Valentine's Day, was arrested and charged with trespassing at the school on Monday.

The Broward County Sheriff's Office said in an arrest report that Zachary Cruz, 18, "surpassed all locked doors and gates and proceeded to ride his skateboard through school grounds" and told investigators that he visited the school to "reflect on the school shooting and to soak it in."

The arrest report said school officials had previously ordered him to stay away from the campus in the town of Parkland.

Related: These are the 17 victims of the Parkland school shooting

The sheriff's office said Cruz was recorded on the school's security cameras. It said the school would seek to prosecute Cruz, whose bond was set at $25.

Nikolas Cruz could face the death penalty on 17 counts of murder and 17 counts of attempted murder in the attack on the school on Feb. 14.