Colorado

Students and families were reunited in emotional scenes after the shooting at Arapahoe high school in Colorado.

A 15-year-old girl was in critical condition after the shooting, suspected to have been carried out by an 18-year-old, Karl Pierson, who police say apparently shot himself at the scene.

Karl Pierson, the 18-year-old who opened fire on a high school in Colorado "held strong political beliefs" according to his classmates.

After opening fire at Denver's Arapahoe High School in what the local county sheriff said was most likely a "revenge attack" on a teacher, the teenager fatally shot himself.

A 15-year-old girl was seriously injured in the attack, and two other students were wounded, but have since been released from hospital.

Read: Female student critical after school shooting

The gunman in the Colorado high school shooting has been identified by Arapahoe County Sheriff Grayson Robinson as 18-year-old Karl Pierson.

The gunman was found dead at the scene at Arapahoe High School in Denver.

Read: Police search school shooting suspect's home

The suspected shooter at Arapahoe High School may have been a student seeking revenge over a conflict with a teacher, Arapahoe County Sheriff Grayson Robinson said.

Sheriff Robinson said the identity of the gunman will not be released "until everything is confirmed".

Read: Female student critical after school shooting

A 15-year-old girl remains in a "critical"condition after being shot at a Arapahoe High School in Denver, Arapahoe County Sheriff Grayson Robinson told a news conference.

Two other students injured in the attack have been released from hospital.

Read: Family reunite with shooting school students in Denver

There were emotional scenes in Denver as students of Arapahoe High School, where two people were injured in shooting, were reunited with their loved ones.

The suspected gunman was found dead with an apparently self-inflicted gunshot wound at the scene.

Read: Two injured in Colorado high school shooting

Denver police are searching the home of the student suspected of being responsible for the shooting at Arapahoe High School.

Read: Colorado gunman was 'looking for teacher'

Parents are assembled outside Arapahoe High School in Colorado waiting for news of their children, according to a reporter from local newspaper Denver Post.

The gunman at Arapahoe High School in Colorado was looking for a specific teacher when he was confronted by a student, local media has reported.

Local police have said a gunman has been found dead at Arapahoe High School in Colorado with a self-inflicted gunshot wound.

Two people, excluding the gunman, have been confirmed as injured after several shots were heard fired at the school in Centennial.