Security measures were stepped up in the...

"Today Metro Transit Police K-9 Explosive Ordnance Detection Teams will conduct random station and rail yard sweeps throughout the day as part of heightened security associated with today"s terrorist attack on subway stations in Moscow," the statement, issued on Monday, reads.

Enhanced security measures are likely to continue until at least mid-April.

"We will remain on a heightened state of security at least through the upcoming Nuclear Security Summit scheduled in Washington in a few weeks and we are partnering with Federal and local law enforcement for security related to that summit," Metro Transit Police Acting Chief Jeri Lee said.

Twin blasts occurred on Monday morning in the Moscow metro killing at least 38 people and injuring 70. The first took place at 7:52 a.m. (03:52 GMT) at the Lubyanka station near the former KGB headquarters, which now houses the Federal Security Service. The second bomb detonated some 40 minutes later four stops along the line at

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