Shooting at Colorado school leaves gunman dead and student critically injured

A shooting at a school in Colorado has left at least one student injured and the shooter himself dead, police said.

The gunman launched into an attack at the school before apparently shooting himself at Arapahoe High School in Centennial, a suburb of Denver.

Authorities said he brought the gun to school and was looking for a specific teacher there, but was confronted by a classmate.

The teacher fled the school after learning they were sought, Araphoe County Sheriff Grayson Robinson said.

One student was taken to hospital in a critical condition.

Students were seen walking towards the school's running track with their hands in the air. Television footage showed students being patted down.

The school is about 8 miles (13 kilometers) east of Columbine High School in Littleton, where two teenage shooters killed 12 classmates and a teacher before killing themselves in 1999.

Friday's shooting occurred the day before the one-year anniversary of the massacre of 20 children and six educators at school in Newtown, Connecticut.