UPDATE: Police say quick response by officers and staff saved lives during school shooting

(Courtesy: KRQE)
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AZTEC, N.M. (AP)
Police got initial reports of gunfire at a New Mexico school shortly after first period began.
Authorities say Aztec High School was locked down and officers responded in less than a minute Thursday.
Aztec Police Chief Mike Heal said officers were able to get into the school through a window and a door and that immediate actions by law enforcement and others helped keep more students safe.
Heal and other authorities were tightlipped at a news conference Thursday, releasing few details other than confirming that the gunman and two victims were dead. No one else was injured.
Officials previously said all three were students.
Heal vowed to get to the bottom of what prompted the shooting, but authorities said they have a lot of evidence to process and interviews to do.
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3:15 p.m.
New Mexico Gov. Susana Martinez says several acts of bravery helped save lives during a deadly shooting at a small-town high school.
Authorities say a student opened fire Thursday at Aztec High School, killing two classmates. The shooter also died.
Martinez told reporters that teachers, school staff and law enforcement jumped in quickly to prevent more deaths. She did not provide any details.
The governor described the day as difficult and called the shooting a heinous and horrific act. She called for New Mexicans to unite and support the small community of Aztec.
Authorities haven't identified the shooter or the victims. They also haven't provided any details about what led to the shooting or how it unfolded.