BREAKING NEWS! At least 10 killed and 50 injured in bomb blast at St. Petersburg, Russia subway station

Summary

1. Explosion hits St Petersburg metro in Russia, killing at least ten  people
2. The blast hit a carriage between the Sennaya Ploshchad and Tekhnologichesky Institut stations, officials say
3. The metro system has been evacuated and closed
4. President Putin says all causes are being considered

At least 10 killed and 50 injured in bomb blast at St. Petersburg, Russia subway station