KEY POINTS:
At least eight people were killed and 56 were injured yesterday in an explosion on a bus in the Russian city of Togliatti and authorities said they were treating the suspected bombing as a terrorist act.
The explosion, which came as people travelled to work in the rush hour, was probably caused by about 1kg of explosives.
Some of those injured, including passengers and bystanders, were in a critical condition, news agency Interfax said.
