MOSCOW, Oct 31 (Reuters) - At least seven people were killed on Wednesday in an explosion on a bus in the Russian city of Togliatti, Russian news agencies said.

The cause of the early morning explosion at an intersection in the city, was not immediately clear, Interfax news agency quoted the Russian emergencies ministry as saying.

More than 20 people were injured in the incident in Togliatti which is situated on the Volga river more than 1,000km (620 miles) southwest of Moscow.

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