Twenty-three people remained hospitalised on Wednesday following a school shooting in the Russian city of Kazan which killed nine people, including seven youngsters. All 23 were in stable condition Wednesday morning, the authorities said, though at least eight people - three adults and five children - were to be transferred to Moscow for treatment.

A gunman on Tuesday morning attacked a school in Kazan, a city 430 miles (700 km) east of Moscow, sending students hiding under their desks or running out of the building. Nine people - seven students and two school employees - were killed. The attacker, identified only as a 19-year-old, was arrested. The authorities gave no immediate details on a motive, but said he legally owned a firearm.

Wednesday was declared a day of mourning in Tatarstan, the Russian region of which Kazan is the capital, with funerals of the victims expected to take place. Russian media said the gunman was a former student at the school who called himself "a god" on his account on the messaging app Telegram and promised to "kill a large amount of biomass" on the morning of the shooting. Attacks on schools are rare in Russia, and President Vladimir Putin reacted by ordering the head of the country's National Guard to revise regulations on the types of weapons allowed for civilian use.

The deadliest school attack in Russia took place in 2004 in the city of Beslan, when Islamic militants took more than 1,000 people hostage for several days. The siege ended in gunfire and explosions, leaving 334 dead, more than half of them children.

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