Fernandez's friends posted on his page and wore T-shirts that memorialized him during a candlelight vigil that brought together hundreds of mourners late Thursday. Authorities said it could be a few hours before the lock down was lifted.
Police set up an area in a park for parents to pick up their children, the San Juan County Sheriff's office said on its Facebook page. But it started getting closer and louder and it was obvious it was gunshots.
Officials previously said all three were students.
The teacher had locked the door as he normally does and the students hid in a corner of the room.More news: California fire weather less dire than predicted
Officials from the Aztec Municipal School District said they could not comment at this time and had to leave their lines open for incoming calls about the shooting.
Aztec is a rural town of 6,500 people in the heart of northwestern New Mexico's oil and gas country and near the Navajo Nation. They also were asking any students who might have seen something to call police.
A crowd of nervous parents gathered at Aztec City Hall to wait for more information.
Authorities evacuated all the buildings in the school premises quickly after the incident. Reports had circulated earlier that 15 had been injured, but both the San Juan County Sheriff's Department and State Police have said no there were no one else was injured.More news: Is this the cute reason for Harry and Meghan's wedding cake choice?
The school is in the Four Corners region and is near the Navajo Nation. No other injuries were reported.
After the shooting began, the school was placed on lockdown, and police swept through the buildings, clearing them one by one.
Local, state and federal authorities said at a news conference that they had a lot of evidence to process and many interviews to conduct.
Sheriff Ken Christesen confirms the shooting at Aztec High School on Thursday morning.More news: TGA 2017: From Software Next Game Teased With a Super Short Teaser
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