Winter Olympics security concerns continue after increase in threats

SOCHI, Russia -- There will be an unprecedented security presence at next month's Winter Olympics in Sochi, Russia after an increase in reports of threats.

A top United States official told ABC News that more than 50,000 security officers are making sure closed circuit cameras are everywhere along with a security blimp that will fly over Olympic Park.

Armed Navy ships will also be standing by patrolling the nearby waters but the real worry for security experts is not about the sports venues.

"The greater threat is to softer targets in the greater Sochi area, and in the outskirts, beyond Sochi, where there is a substantial potential for a terrorist attack," said National Counter-terrorism director Matthew Olsen.

Meanwhile, Russian officials said they detained two brothers who allegedly transported the suicide bombers responsible for terrorist attacks last month in the cityof Volgograd, about 400 miles from Sochi.