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Children and a teacher have been killed in a shooting at a school in the Russian city of Kazan.
Reports over the number of deaths varied, but officials said at least seven children had died. Many more were wounded and taken to hospital.
A teenager was detained after the attack at the school, located some 820km (510 miles) east of Moscow in the mainly Muslim republic of Tatarstan.
Reports initially said that there were two shooters, one of whom had been killed. But officials later said there was only one suspect.
Officials have confirmed eight deaths.
Mr Minnikhanov said the victims included four male and three female eighth-grade students. His press service later added that a teacher was also killed.
He told reporters outside the school that in addition to the fatalities, 12 children and four adults were being treated in hospital.
"The terrorist has been arrested. He's 19. He's a registered firearm owner," he said.
One video on social media captured a teenager lying on the ground apparently being detained outside the building.