Russian police round up dozens

IOC president says Sochi Games will be safe

Russian police detained dozens of people on Tuesday in sweeps through Volgograd after two deadly attacks in less than 24 hours that 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. Investigators said 14 people died in a bus bombing on Monday but health officials put the toll at 16.