Suicide bombings in Russia kill over 30:

A suicide bomber killed 14 people aboard an electric bus in the southern Russian city of Volgograd during the Monday morning rush hour, and authorities believe it was the work of the same group that set off a bomb at the railway station a day earlier.
http://www.washingtonpost.com/world/europe/at-least-10-killed-in-bus-explosion-volgograd/2013/12/30/234aa338-7115-11e3-bc6b-712d770c3715_story.html