At least nine people, including a teacher and eight students, have been killed in a shooting spree that followed an explosion at a school in Kazan, the capital of Russia’s Republic of Tatarstan.

Media reports say that more than one person opened fire at School No. 175 on Dzhaudat Faizi Street in the city, which has more than 1,000 students. According to reports, one of the attackers was shot dead by police while at least one remained inside the building, holding hostages. Some reports also say that one attacker, a teenager, was apprehended.

The area has been cordoned by law enforcement and students and teachers are being evacuated via windows.