A gunman killed several children and a teacher in a school shooting incident in Kazan, southwest Russia, according to official statements from the regional governor. Rustam Minnikhanov said on Tuesday that four male and three female eighth-grade students died in the shooting. Twelve more children and four adults were hospitalized in the attack, Minnikhanov added. He made no mention of the death of a teacher, which had been in many of the early reports across various outlets. However, Minnikhanov's press service later added that a teacher was also killed. "The terrorist has been arrested, (he is) 19 years old. A firearm is registered in his name. Other accomplices haven't been established, an investigation is underway," Rustam Minnikhanov said after visiting the school, adding that security had been restored. Initial reportage from various national media outlets gave a somewhat distorted view of the incident. Interfax Agency reported that two gunmen had opened fire in the school, and one of them — a 17-year-old — had already been apprehended. Other reports have begun to suggest that a single shooter acted alone. Russian media outlets also have conflicting numbers for deaths and injuries as the full extent of the horrific incident is still unwinding, but the latest report from Tatarstan health officials says 21 people were hospitalized with wounds after the attack, including 18 children, six of them in intensive care. In an earlier statement released by Kazan's mayor's office, the casualty figures were said to be "a total of 8 people, of whom 7 were children, and 4 more people were injured to the original figures (now 20). "We are sorry for the loss, this is a terrible tragedy. We will try to keep you updated with further developments," the statement read. Russia's National Anti-Terror Committee also released a statement. They are also only mentioning one attacker. "An armed criminal opened fire at gymnasium No. 175, located on Jaudata Faizi Street. An anti-terrorist operation is being carried out on the territory adjacent to the gymnasium, and an appropriate legal regime has been introduced. The power structures are carrying out the necessary operational-search measures and investigative actions. The evacuation of students was carried out. The attacker was detained by law enforcement officers." — Euronews