SHOPPERS RECEIVING TREATMENT AFTER MYSTERY GAS EXPOSURE

It's hard to resist the temptation to speculate about culprits when you read something like this:

Dozens of shoppers in Russia's second city of St Petersburg have been treated by doctors after breathing in a mystery gas in a trading centre, emergency workers said.

A spokesman for the Emergencies Ministry said 70 people had appealed for help after smelling the gas.

Unexplained canisters had been found in two other shops of the Maksidom chain, and the shops had been evacuated.

Russian media reported the containers had been set up with timing mechanisms to go off as time-bombs.

Who would want to kill innocent Russian shoppers?