Cities across the country and the globe have tightened security in the wake of the Boston Marathon explosions that killed three and injured more than 150 people. In London, British security forces are reviewing security measures for Margaret Thatcher's funeral, scheduled for Wednesday, and for its own marathon, which occurs Sunday. But officials say both events will go on as planned. "We are absolutely confident here that we can keep the event safe and secure," British Sports Minister Hugh Robertson tells The New York Times of London's marathon. "I think this is one of those incidents where the best way to show solidarity with Boston is to continue and send a very clear message to those responsible." Major metropolises around the world are following suit, beefing up security around sporting events and transportation hubs. Here, a look at those who are stepping up to keep us safe.
London: The Queen's Life Guards and police officers ride down the London Mall, where the finish area for the forthcoming London Marathon is to be located. London's race will be the first major international marathon to take place after the Boston Marathon explosions. (AP Photo/Sang Tan)
Boston: National Guard troops stage near the Boston Commons before going on a sweep near the scene of the bombings on the evening of April 15. (REUTERS/Scott Eisen)
Los Angeles: A van is searched at a check point at the entrance of the Los Angeles International Airport on April 15. (Kevork Djansezian/Getty Images)
Washington, D.C.: The White House is cordoned off and Secret Service stands guard on Pennsylvania Avenue on April 15. (Alex Wong/Getty Images)
Berlin: A German police car guards the front of the United States embassy in Berlin on April 16. (AP Photo/Markus Schreiber)
Boston: A transit police dog sniffs a backpack at the Back Bay transit station on April 16. (REUTERS/Jessica Rinaldi)
Chicago: Patrons are searched and patted down at the start of the NHL game between the Dallas Stars and the Chicago Blackhawks on April 15. (REUTERS/Jeff Haynes)
Russia: A police officer and security guards check a bus on entering the Olympic Park that is under construction for the 2014 Winter Games in the Black Sea resort of Sochi. (AP Photo/Artur Lebedev)
Los Angeles: Amtrak Explosive Detection K-9 officer Kenneth Wolf and his dog Teddy patrol the station tunnels at Union Station on April 15. (AP Photo/Damian Dovarganes)
New York City: A New Jersey State Police helicopter circles the construction site of One World Trade Center in Manhattan on April 15. (AP Photo/Julio Cortez)
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