Shooting reported at Colo. high school: Sheriff says gunman in shooting at Arapahoe HS is dead

Gunman ID'd as Karl Halverson Pierson

CENTENNIAL, Colo. - A student shot at least one other student at Arapahoe High School near Littleton, Colo., Friday before he apparently killed himself, authorities said.

Arapahoe County Sheriff Grayson Robinson said the shooter, identified as 18-year-old Karl Halverson Pierson, entered the school, located in Centennial, at about 12:30 p.m. Mountain time armed with a shotgun looking for a teacher he identified by name.

Robinson said Pierson made no attempt to hide his weapon after entering the school from a parking lot
"The teacher began to understand that he was being looked at and exited the school. One student confronted the armed student and was shot," Robinson said.

Robinson did not elaborate on any possible motive except to say Pierson had had a "confrontation or disagreement" with the teacher.

MORE IMAGES -- Arapahoe High School shooting: http://bit.ly/1kH3nmT

The critically injured student was in surgery at a nearby hospital, said Jason Dunkel, spokesman for Littleton Adventist Hospital.

The gunman is believed to have acted alone, according to authorities.

Authorities said during their investigation they have found two Molotov cocktails at the scene. One of them detonated, but the other did not, according to authorities.

Police were outside the school, and students were seen walking toward the school's running track with their hands in the air. Television footage showed students being patted down.

The school is about 8 miles east of Columbine High School in Littleton, where two teenage shooters killed 12 classmates and a teacher before killing themselves in 1999.

The shooting also came a day before the first anniversary of the school massacre in Newtown, where a gunman killed 20 children and six adults at Sandy Hook Elementary School.

Tracy Monroe, who had step-siblings who attended Columbine, was standing outside the high school looking at her phone, reading text messages from her 15-year-old daughter inside.

Monroe said she got the first text from her daughter, sophomore Jade Stanton, at 12:41 p.m. The text read, "there's sirens. It's real. I love you"

A few minutes later, Jade texted "shots were fired in our school." Monroe rushed to the school and was relieved when Jade texted that a police officer entered her classroom and that she was safe.

Monroe was family friends with a teacher killed in the Columbine shooting, Dave Carpenter.

"We didn't think it could happen in Colorado then, either," Monroe said.

More than 2,100 students attend Arapahoe High School where nine out of 10 graduates go on to college, according to the Littleton Public Schools website.

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