While many around the world rejoiced at news that Osama Bin Laden, Al-Qaeda founder and architect of the September 11th attacks, had been killed by U.S. military forces, the news does not come without concern about possible violence in the aftermath of the historic event.
The U.S State Department has issued a worldwide advisory to America citizens traveling and residing abroad about what it called "enhanced potential for anti-American violence given recent counter-terrorism activity in Pakistan."
"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," the advisory said.
U.S. government facilities, such as embassy buildings, worldwide remain at a heightened state of alert, according to the advisory. These facilities may temporarily close or periodically suspend public services to assess their security posture. In those instances, U.S. Embassies and Consulates will make every effort to provide emergency services to U.S. citizens, State Department officials said.
Officials in U.S. cities said they were stepping up security at popular spots and on public transportation with increased monitoring and police presence.
New York's Port Authority said more security personnel would be working bridges and airports under its jurisdiction.
In Los Angeles, police were increasing intelligence monitoring. LAPD Deputy Chief Mike Downing told media police would be increasing patrols in areas considered high risk, such as religious institutions.
In Washington D.C., more uniformed police officers were put on the city's public transportation system.
In San Francisco, police officials warned officers to watch for possible demonstrations or public gatherings.