An armed teenager shot dead three students at a school in the US state of Michigan. At least six people were injured in the attack, including a teacher, reported CNN.

The bomber struck shortly after noon in front of a rally in Oxford High School, Michigan, north of Detroit.

The motive for the attack is still unknown, Oakland County Deputy Sheriff Mike McCabe told a news conference.

Police say at least four people are injured after a shooting at a Michigan high school. A suspect is in custody. https://t.co/1M0I6qpNKg

- CNN Breaking News (@cnnbrk) November 30, 2021

The attacker is only 15 years old

The attacker was arrested at the school, and his identity has not yet been announced. All that is known is that he is 15 years old and is a second grade student in the American education system.

Police also found the gun from which he fired. The names of the victims have not yet been released.

Police received a report of a shooting at the school around 12:55 p.m. local time. Specialists and an ambulance were sent to the scene immediately.

We are still inspecting the school and looking for possible victims. The students have been evacuated, the sheriff's office said.