The Montgomery County teenager charged with shooting a classmate with an untraceable ghost gun told authorities that he purchased the components online and that a friend helped him put them together, a prosecutor said in court Monday.

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       The details of the Friday shooting that put Magruder High School in lockdown and left a 15-year-old hospitalized in critical condition emerged at a hearing at which Steven Alston Jr., 17, was ordered held without bond pending trial.

       The 15-year-old victim “is currently fighting for his life,” said Carlotta Woodward, a prosecutor in the Montgomery County State’s Attorney’s Office.

       Earlier coverage: Magruder put on lockdown after shooting

       Authorities have said the incident never evolved into an active shooter situation, and it grew out a dispute between two students. On Monday, Woodward said that Alston came to school with the weapon — a 9mm handgun — already loaded. About 1 p.m., with the gun stuffed in his waistband, he allegedly entered a boys’ bathroom.

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       “This defendant removed a handgun from his waistband and pointed it at the head of the victim,” Woodward said.

       The victim pushed it away, and Alston then shot him in the pelvis area, Woodward said.

       Alston, a 11th-grader, has been charged as an adult with attempted second-degree murder, felony assault and weapons offenses.

       An attorney for Alston, Lucy Larkins, did not address the allegations directly during the hearing. But she asked Montgomery County District Court Judge Zuberi B. Williams to allow Alston to be released to home detention — citing his lack of criminal history — so he could take classes virtually.

       “I know he is committed to continuing his studies,” Larkins said.

       Williams denied the request but granted her request to move Alston to a juvenile facility.

       Alston was discovered in a classroom with other students Friday and — around 3 p.m. — arrested by police officers. They found the gun near him, but it had been disassembled, authorities said.