The Latest: Sheriff: Heroes saved lives in school shooting

AZTEC, N.M. (AP) — The Latest on a shooting at a New Mexico high school (all times local):
11:50 a.m.
Authorities say heroes helped save lives during a deadly shooting at a New Mexico high school.
San Juan County Sheriff Ken Christesen told reporters Friday that a substitute teacher heard the gunshots Thursday morning at Aztec High School but didn't have a key to lock the door to the computer lab.
So she took students into an office or storage area and barricaded the door with a couch.
He says 21-year-old William Atchison came to the room and yelled that he knew they were in there and then fired multiple shots into the room.
Christesen says a custodian also heard the gunshots and yelled for classrooms to lock their doors.
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11:40 a.m.
Authorities say a gunman killed two students randomly at a New Mexico high school in a planned attack.
San Juan County Sheriff Ken Christesen told reporters Friday that 21-year-old William Atchison of the small town of Aztec had legally purchased a 9mm Glock pistol a month ago.
State Police Chief Pete Kassetas says the shooter had multiple magazines with him and went to a bathroom after disguising himself as a student to get into Aztec High School.
He says Francisco I. Fernandez had excused himself from class to go to the bathroom and was immediately shot. Kassetas says Atchison then walked into the hallway, encountered Casey J. Marquez and killed her.
Authorities say he walked up and down the hallway, firing randomly and into classrooms.
Officials say they believe Atchison shot himself.
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11:30 a.m.
The FBI says online comments made last year by a gunman who killed two students at a New Mexico high school had led them to conduct an investigation.
Terry Wade, FBI special agent in charge in Albuquerque, told reporters Friday that the 21-year-old made generic comments in a gaming forum and the agency checked databases and interviewed him and his family in March 2016.
Wade says the man didn't have a gun at that time and told agents that he had no plans for an attack. He also didn't have ties to any organizations.
The FBI closed the investigation when it determined no crime was committed.