A policeman guards near the World Trade Center site in New York, the United States, May 2, 2011. New York City stepped up its police force in major public locations on Monday in the wake of the death of Osama Bin Laden. More policemen and police vehicles have been deployed at Times Square and in the financial district since Monday morning. U.S. President Barack Obama announced the death of al-Qaida leader Osama bin Laden who planned the 9/11 terrorist attacks Sunday night. [Xinhua/Wu Jingdan]