Metro, Capitol Police and other agencies are stepping up security as a precaution following Osama bin Laden's death.
Metro spokeswoman Lisa Farbstein said Metro Transit Police are working with area law enforcement partners to increase security in the system. She said customers are likely to see more uniformed officers in the system beginning Monday.
Farbstein said there are other security measures in place that are designed to be invisible to the public.
Capitol police cars flashed their lights and officers with automatic weapons patrolled in force Monday as a visual warning to anyone seeking to retaliate for Osama bin Laden's death.
Senate Sgt. At Arms Terrance Gainer said Congress's police force is on the lookout for any threat on the Capitol campus as lawmakers returned from a two-week Easter recess.
Ten police vehicles, lights flashing and trunks opened, gathered at the base of Capitol Hill early Monday where Constitution and Pennsylvania avenues meet. Officers with automatic rifles were
examining every vehicle that approached.
In Maryland, Gov. Martin O'Malley talked with state and local officials who have been reminded to be extra vigilant in case of reprisals following bin Laden's death.
O'Malley spokesman Rick Abbruzzese said a conference call was held Monday morning. Abbruzzese said the governor urged law enforcement and local governments to work together to make sure they are in constant communication and cooperating with federal agencies.
Edward McDonough, a spokesman for the Maryland Emergency Management Agency, said about a dozen state agencies were on the call, including the transportation and health departments and the
Maryland State Police.
Meanwhile, The Department of Homeland Security said bin Laden's death could inspire retaliatory attacks against the U.S. and Western targets.
The department's "situational awareness alert," obtained by The Associated Press, said the attacks could come from members of al-Qaida's core branch in the tribal areas of Pakistan, al-Qaida franchises in other countries and radicalized individuals in the U.S. with al-Qaida sympathies. The document was marked "for official use only" and is not finished intelligence.
The alert, issued Sunday, says the U.S. intelligence community doesn't currently have insight into al-Qaida's choice of U.S. targets.
The U.S. Department of State warned U.S. citizens traveling and residing abroad to the enhanced potential for anti-American violence:
Given the uncertainty and volatility of the current situation, U.S. citizens in areas where recent events could cause anti-American violence are strongly urged to limit their travel outside of their homes and hotels and avoid mass gatherings and demonstrations. U.S. citizens should stay current with media coverage of local events and be aware of their surroundings at all times. This Travel Alert expires August 1, 2011.