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Details about the explosive devices used in Boston are still coming in. Representative Ted Poe (R-Texas) said in an interview that the devices were similar to IEDs used in Afghanistan. They were full of ball bearings, which can tear into people like bullets.
Outside of the Northeastern region, bomb-sniffing dogs were deployed yesterday at certain landmarks, government buildings, transit hubs and sporting events. In California, for example, more such dogs are now on patrol inside and outside of Los Angeles International Airport and SFO in San Francisco.
Detroit, Las Vegas, Atlanta, Seattle and most major cities nationwide are also reviewing their own security measures and stepping up police and police dog presence.
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Outside of the United States, there is particular concern in London due to Wednesday's planned ceremonial funeral for former Prime Minister Margaret Thatcher as well as Sunday's London Marathon. You can count on numerous bomb-sniffing dogs being deployed at both events.