Volgograd blasts: Second suicide bomb hits Russia cityThe blast took place at a busy time on a busy route, as Daniel Sandford explains At least 14 people have been killed in a suicide bombing on a trolleybus in the Russian city of Volgograd, investigators say. The blast comes a day after 17 people died in another suicide attack at the central station in the city. Security has been tightened at railway stations and airports across Russia. Moscow is co
