A 16-year-old student has been charged as an adult in Monday’s shooting at Thomas S. Wootton High School, which left the suspect’s classmate injured, Rockville officials said Tuesday.

A handgun was also recovered late Monday night, officials said.

The Rockville teen is charged with attempted second-degree murder, two counts of first-degree assault, two counts of second-degree assault and multiple gun charges, including possession of a dangerous weapon on school property.

The victim, a male acquaintance of the suspect, is in stable condition at a local hospital.

Before the shooting, the suspect pointed a gun at a 15-year-old female student. She was not injured, Rockville City Police Chief Jason West said Tuesday.

West also said the gun recovered in connection with the shooting, a Polymer80 9 mm handgun, is a “ghost gun,” a privately made firearm that lacks a serial number.

“We know that these type of firearms are very difficult to trace if we can do so at all,” he said during a Tuesday afternoon media briefing.

Detectives are investigating how the suspected shooter obtained the gun, how it came into the school and a motive for the shooting.

The suspect is expected to appear at a bond hearing Wednesday afternoon in Montgomery County District Court. He is currently being held without bond in the Montgomery County Detention Center’s Central Processing Unit in Rockville.

Maryland law dictates that, despite his young age, he is charged as an adult in this case, said Montgomery County State’s Attorney John McCarthy.

“If you commit either an attempted first- or second-degree murder, or use a handgun in the commission of these crimes, the original jurisdiction is in the adult court,” McCarthy said.

This story’s headline was corrected to state the teen was charged with attempted murder.