At least seven people have died and 15 were injured during a school shooting in Nonthaburi Province, Thailand, on Friday morning, Thai media reported.

The deceased include three teachers, three students and the gunman, according to the province's disaster prevention and mitigation office.

A witness at the scene said that the gunman, wearing a purple tracksuit, fired dozens of shots inside the school.

The gunman was confirmed to be a student and died by suicide.