At least 11 persons have been killed and several others sustained injuries as a gunman/gunmen opened fire in a school at Kazan in Russia.

According to reports, among the 11 killed in the incident, 10 were children and 1 was a teacher of the school.

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According to Russian State news agency RIA, one 19-year-old gunman had been detained and that an explosion had been heard at the school.

Some of the Russian news agencies reporting two teenage gunmen were involved and others said a sole shooter took part.

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The incident has been reported from School Number 175 at Kazan in Russia.

Kazan is located 725 kilometers east of the Russian capital – Moscow.

It is the capital of the Muslim-majority region of Tatarstan.

The motive of the attack is yet to be ascertained.

Around 21 ambulances rushed to the attack site, with local officials also turning up.

Some students were also reportedly seen jumping out of the windows to escape the shooting.