One day after two teens were shot and killed at a Kentucky high school, prosecutors say they want to charge the student suspect as an adult. Assistant Marshall County Attorney Jason Darnall said the case will be presented to a grand jury on Feb. 13 where a decision on how the 15-year-old will be charged will be made.

The accused student gunman, who remains in custody, entered Marshall County High School in Benton, Kentucky, at 7:57 a.m. Tuesday and began firing. Two students, both 15, were killed. They have since been identified by police as Bailey Nicole Holt and Preston Ryan Cope. Eighteen others were injured in the mass shooting. Of those, 16 suffered gunshot wounds, while four sustained injuries while trying to escape, although exact details on how they were hurt weren’t released.

The suspect is being held at a secure juvenile facility and will appear in court on Thursday morning. He’s charged with two counts of murder and 12 counts of first degree assault. His name has not been released by authorities.