New York, Los Angeles, and Washington, D.C. have stepped up police presence on transit, at tourist attractions, and near hotels.

Major cities across the United States remain on high alert this morning, less than a day after two bombs ripped through a crowd at the finish line of the Boston Marathon, killing at least three and injuring more than 130 others.

Law enforcement agencies have beefed up security at high-value targets across the country. Some cities, like New York, are also "moving counterterrorism forces into place around major centers and landmarks," CBS News reports. In Times Square, for example, police cars lined the curb and officers are patrolling most every corner. New York's biggest hotels are also now home to added police presence. According to USA Today:

Hotels in the Times Square area were seeing "seriously stepped up" police presence, said Robert Snyder, a senior executive with Tishman, which owns the InterContinental and Westin hotels in that tourist-heavy area. The two hotels were checking people's key cards before they were allowed to enter the building. They were "admitting only registered guests," Snyder said.

Los Angeles and Seattle have also increased police presence at busy tourist attractions, according to USA Today. In D.C., Pennsylvania Avenue in front of the White House has been closed to pedestrians.

Officers patrol Times Square in New York following bombing attacks in Boston. (Lucas Jackson/Reuters)

New York's Times Square saw added security measures following Monday's attacks in Boston. (Lucas Jackson/Reuters)

Officials have also increased security on public transportation. Bags are being searched at many New York City subway stops; in Los Angeles, extra police were sent to the airports to keep an eye for suspicious activity, as well as to last night's Dodgers game.
At Monday's Chicago Blackhawks game, police were on hand to pat down attendees and search bags.

Cities have also taken to Twitter and Facebook to encourage the public to be vigilant and report suspicious packages.

In Boston, obviously, security is especially tight. Much of the downtown neighborhood around yesterday's bombing will remain closed, though the Globe reports that some streets will be reopened today. The Prudential Center, a shopping center, can only be accessed from its Huntington Avenue entrance, not from Boylston Street, where the explosion occurred.

The MBTA has opened the T, though the Copley Square station remains closed. Officials will be conducting random bag searches throughout Boston, and police presence around the city will be "heavy," the Globe reports.

Amtrak passengers were met by police with a bomb-sniffing dog who strolled alongside passengers. Baggage was swabbed by police and put through explosives-detecting scanner before passengers were allowed to board.

According to CNN, officials are questioning travelers as they prepare to leave Boston from Logan Airport and Boston South Station. They're hoping to collect video and photographic footage, along with any insight into possible suspects. 

As Gov. Deval Patrick told reporters, today in Boston “will not be business as usual.” 

Top image: Patrons are searched and patted down with heightened security measures in effect due to the bombings in Boston before the start of the NHL hockey game between the Dallas Stars and the Chicago Blackhawks in Chicago. (Jeff Haynes/Reuters)

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