Police in Los Angeles, New York City, London, Washington and other cities worldwide stepped up security Monday after explosions at the Boston Marathon.
Los Angeles, New York: The Sheriff's Department activated its emergency operations center and increased patrols at transit hubs, schools and county buildings, while in New York, critical response teams were deployed citywide and officials stepped up security at hotels and other prominent locations.
California: Emergency management officials activated their statewide threat assessment system, which was established after the Sept. 11, 2001, World Trade Center attacks. Officials in multiple cities and counties throughout the state were reviewing information from federal authorities for possible threats.
White House: The Secret Service quickly expanded its security perimeter, shutting down Pennsylvania Avenue and cordoning off the area with yellow police tape. The White House was not on lockdown.
Tampa International Airport: TIA spokeswoman Janet Zink said that airport police and Transportation Security Administration officers stepped up foot patrols around the main terminal and airsides. Airport police vehicles also intensified their patrols of the airport roundabout.
Airports: Flights in and out of Boston were grounded and the airspace over Washington, D.C., was closed. Police at three Los Angeles area airports, including Los Angeles International, were in a "heightened state of vigilance," with increased patrols, said Chief of Airport Police Patrick Gannon.
Upcoming marathons: British authorities said they were re-examining plans for Sunday's London Marathon — the next major international marathon. The San Francisco Police Department was also reconsidering security for the San Francisco Marathon in June and the Bay to Breakers race in May. In Indianapolis, authorities were reviewing security for next month's 500 Festival Mini-Marathon, while in Nashville, increased security precautions were being considered for the Country Music Marathon on April 27. Stepped up security was also put in place for this weekend's marathon in Lansing, Mich.
Times wires, staff