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Colorado high school shooter has been identified as 18-year-old Karl Pierson

CENTENNIAL, CO –  The gunman at Arapahoe High School has been identified as 18-year-old Karl Halverson Pierson, Sheriff Grayson Robinson told reporters Friday night.

“We firmly believe he is dead from a self-inflicted gunshot wound,” Robinson said.

Authorities also revised the number of students wounded in the shooting to one.

Two students were previously reported to have suffered gunshot wounds. But Robinson said an investigation concluded there was only one. Blood on another person was from the sole victim, he said.

Original story:

A student who opened fire Friday inside a suburban Denver high school appears to have been seeking revenge against a faculty member because of a “confrontation or disagreement,” the Arapahoe County sheriff said.

The shooter wounded students before turning the gun on himself and taking his own life, Sheriff Grayson Robinson told reporters.

The shooting began after the student walked into Arapahoe High School in Centennial with the intention of confronting a specific faculty member, Robinson said.

“The suspect has been found inside the school and he has deceased as a result of what appears to be a self-inflicted gunshot wound,” Robinson said in one of his first statements after the shooting. The sheriff declined to immediately identify the dead gunman.

At least one person — a minor — was taken to Littleton Adventist Hospital with a gunshot wound, Lauren Brendel, a hospital spokeswoman, told CNN.

Brendel did not release the age, gender and condition of the minor.

Two other people were taken to Swedish Medical Center where they were reported in good condition, a hospital spokeswoman said.