An 11-year-old student has opened fire in a school in northern Mexico, killing a teacher and injuring at least six other people before shooting himself dead, officials say.The incident happened at the private Colegio Cervantes school in the city of Torreón in Coahuila state.It was not immediately clear what his motives were. Though murders are on the rise in Mexico, school shootings are rare.The boy – who has not been identified – was a good student who lived with his grandmother and had normal behaviour, Mayor Jorge Zermeño told Milenio TV. He carried two guns, Mr Zermeño said. It was not clear how the boy had obtained them.The shooting happened at about 09:00 local time (15:00 GMT) on Friday in Torreón, some 800km (500 miles) from the capital, Mexico City.The mayor said police were still trying to locate his parents. Dozens of police and soldiers have surrounded the school.The injured included five students and a physical education teacher. They are in stable conditions in hospital.Coahuila state Governor Miguel Angel Riquelme said the boy had asked to go to the bathroom at the start of the school day.His teacher went to look for him after 15 minutes, and the boy then emerged firing his weapons, Mr Riquelme said."He was well behaved, but he told some of his classmates that 'today was the day'," he said.Mr Riquelme said the boy had worn a T-shirt bearing the name of the video game Natural Selection, partly a first-person shooter game.How dangerous is Mexico?On the front line of the battle for KharkivMariupol running out of food and water, says Red CrossThe Capitol riot trial that tore a family apartThe Russians using emojis to evade censorsThe Capitol riot trial that tore a family apartRos Atkins on… food price rises and the Ukraine war. VideoRos Atkins on… food price rises and the Ukraine warIsrael plays peacemaker in Ukraine-Russia warChildren of the Soviet era running from RussiaDrought robs Amazon communities of 'life-giving' riverDolly's novel approach to writing first book. VideoDolly's novel approach to writing first bookThe enduring menace of Kenya's motorbike taxisBBC Travel: A stunning lake hidden in plain sight'Everybody's got the potential to stalk'Stacey Dooley meets victims and perpetrators of a crime that devastates livesThe dark side of being an influencer…Can aspiring musician Sasha break free from it?Has social media affected porn?Louis Theroux explores the issue with consent in the industry© 2022 BBC. The BBC is not responsible for the content of external sites. Read about our approach to external linking.