The death toll has risen to 13 people, including seven children after a man opened fire on Monday at his former school in central Russia, authorities said.
The attack was the latest in a series of school shootings that have shaken Russia in recent years and came with the country on edge over efforts to mobilize tens of thousands of men to fight in Ukraine.
Russian President Vladimir Putin denounced the “inhuman terrorist attack” in the city of Izhevsk, the Kremlin said, adding that the shooter “apparently belongs to a neo-fascist group”.
According to investigators, the attacker “was wearing a black top with Nazi symbols and a balaclava” when his body was discovered.
He was later identified as a local man born in 1988, who graduated from this school.
Investigators have said two security guards and two teachers were among the victims, while the attacker “committed suicide”.
Authorities previously announced a death toll of nine people but did not specify if that included the suspected shooter.
Investigators said they were conducting a search in his home and looking into his “adherence to neo-fascist views and Nazi ideology”.
The region’s governor Alexander Brechalov confirmed there were “casualties and wounded among children”, speaking in a video statement outside school No88 in Izhevsk.
Rescue and medical workers could be seen in the background, some running inside the school with stretchers.
Russia’s health ministry said “14 ambulance teams” were working at the scene to help the injured, news agencies reported.
Brechalov declared a period of mourning in the region to last until Thursday.
A city of around 630,000 people, Izhevsk is the regional capital of Russia’s Udmurt Republic, located around 1,000 kilometers (620 miles) east of Moscow.
The attack came just hours after a man had opened fire and severely wounded a recruitment officer at an enlistment center in Siberia.
Russia’s last major school shooting was in April, when an armed man opened fire in a kindergarten in the central Ulyanovsk region, leaving a teacher and two children dead.
The shooter, described as “mentally ill”, was later found dead, with officials saying he had shot himself.
