At least eight people were killed in the attack - seven eighth-grade students and a teacher - and 21 others were hospitalized, Russian officials said. "Other accomplices haven't been established, an investigation is under way", Minnikhanov said after visiting the school.
At least 11 people were killed Tuesday in a shooting at a school in southwest Russian Federation, according to reports.
Firefighters walk past ambulances and police cars and a truck parked at a school after a shooting in Kazan, Russia, Tuesday, May 11, 2021.
Relatives of students who attend a school in the Russian city of Kazan, where a gunman opened fire on Tuesday, killing several students and at least one teacher and injuring more than 20 others.
Russian state media TASS reported that a second shooter may still be roaming the school, according to a law enforcement source.
Prime Minister Mikhail Mishustin spoke of "great sorrow", while Tatarstan's leader Rustam Minnikhanov described the attack as a "major tragedy".
Images broadcast on state television from the scene showed dozens of people outside the school building with fire services and police vehicles lining nearby streets.
"I was in class, I first heard an explosion, then gunshots", TASS quoted a teacher as saying.
"There is heavy smoke", the source added.
While school shootings are relatively rare in Russian Federation, there have been several violent attacks on schools in recent years, mostly carried out by students.
He said a 19-year-old "terrorist" who was "officially registered as a gun owner" had been arrested in the attack, according to Reuters.
Kazan, about 700 kilometres east of Moscow, is a city of 1.2 million people and is known as the "third capital of Russia".
The Crimea shooter, Vladislav Roslyakov, was able to legally obtain a gun licence after undergoing marksmanship training and being examined by a psychiatrist.
School shootings in Russian Federation are rather rare. Khinshtein also said the school didn't have any security aside from a panic button.