In the hours after suicide bombers killed dozens in the Moscow subway system, transit rail systems in New York and Washington, D.C. are heightening security.
The District is beefing up the presence of uniformed Metro Transit Police officers at stations and on subway platforms, and bringing in more bomb-sniffing dogs.
New York’s Metropolitan Transit Authority (MTA) has taken similar precautions, rolling out more security during rush hours and at major transit hubs.