CASTLE ROCK, Colo. (AP) — Two students suspected of shooting nine classmates, one fatally, in their Colorado charter school appeared in court Wednesday to face dozens of criminal charges that included murder, attempted murder, theft and arson.

The charges were filed on the same day a memorial service was scheduled for Kendrick Castillo, the 18-year-old student who was killed while trying to stop the May 7 attack at the STEM School Highlands Ranch, which is not far from the scene of the 1999 Columbine massacre.

Investigators say Devon Erickson, 18, and Alec McKinney, 16, used handguns in the assault. Eight students were wounded.

While court documents are sealed, the names of charges against the gunmen were listed in electronic court records without any more details. It was not clear if McKinney was being charged as an adult.

Erickson looked toward the judge while attorneys discussed the case. He wore a jail uniform and was kept shackled at his wrists and ankles after Judge Theresa Slade denied a motion to remove them.