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Several people have been killed when a gunman opened fire at a university in the Russian city of Perm, reports say.
The assailant walked on to the campus on Monday morning and started shooting.
Students and teachers barricaded themselves inside the university building; others were seen jumping from windows.
It is unclear how many people were injured. Russian police say the attacker has been detained.
Russia's official Investigations Committee says the attacker was a student at the university.
The incident occurred at at Perm State University, located around 1,300 kilometres (800 miles) east of the capital, Moscow.
Footage of students jumping out of windows was shown on Russian TV: