Seven children have been killed during a school shooting in the city of Kazan in south-west Russia, according to the region's Governor.
Rustam Minnikhanov, Governor of the Tatarstan republic which has Kazan as its capital, said four male and three female grade eight students died in the shooting.
Twelve more children and four adults were hospitalised after the attack, Mr Minnikhanov said.
"The terrorist has been arrested," Mr Minnikhanov said after visiting the school.
"[He is] 19 years old. A firearm is registered in his name."
"Other accomplices haven't been established."
"An investigation is underway."
Russia's state RIA Novosti news agency earlier reported 11 people were killed in the school shooting, citing local emergency officials.
There was no way to immediately reconcile the differing death tolls.
It was not immediately clear what the motive for the attack was.
Video footage shared on social media showed emergency service vehicles parked outside the school, with people running towards the building. Other videos showed broken windows with debris outside.
Police have opened a criminal investigation into the incident.
While school shootings are relatively rare in Russia, there have been several violent attacks on schools in recent years, mostly carried out by students.
