Students hid in their classrooms, some behind locked doors, as a suspect opened fire Thursday inside a New Mexico high school, killing two classmates before ending up dead. Authorities and other officials in the small town of Aztec near the Colorado border have released few details other than to say the shooter and the two victims all attended Aztec High School. No other injuries were reported, and it was not clear if the shooter died by suicide or was killed by police. Local and federal authorities are investigating what led to the shooting and did not immediately release any details about the circumstances. A news conference was planned later Thursday.