At least nine people, eight of them children, have been killed by gunfire at a school in the Russian city of Kazan, reports say.

A teacher also died in the incident 820km (510 miles) east of Moscow.

Reports say two people opened fire and a 17-year-old boy is said to have been detained.

An explosion was also heard, reports say, quoting emergency services. Kazan is in the mainly Muslim republic of Tatarstan.

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