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.