Dozens detained as Putin grapples with security threat

Police detained dozens of people yesterday in sweeps through the Russian city of Volgograd after two deadly attacks in less than 24 hours raised security fears ahead of the Winter Olympics.

A man wounded when a bomber set off a blast in the city’s railway station on Sunday died overnight, bringing the toll in that attack to 18. Regional governor Sergei Bazhenov said 16 died in a trolley bus bombing on Monday.

There was no indication that any of those held was connected to the attacks.