Sixty-six people were rushed to hospital on Monday after bombs containing capsules of an unidentified gas exploded in three trade centres of Russia's second largest city St Petersburg.
According to a RIA Novosti news agency report quoting local department of the Russia's Federal Security Service (formerly KGB), 12 of those hospitalised were in serious condition.
The victims of the attack were suffering from coughing, suffocation and rapid heartbeats. Several