Pakistan army troops remove canvas screens from outside a house, where al-Qaida leader Osama bin Laden was caught and killed in Abbottabad. (AP)Pakistan army troops remove canvas screens from outside a house, where al-Qaida leader Osama bin Laden was caught and killed in Abbottabad. (AP)A Pakistani security official carries metal piece collected from the wheat field outside a house, where al-Qaida leader Osama bin Laden was caught and killed in Abbottabad. (AP)A Pakistani security official outside a house, where al-Qaida leader Osama bin Laden was caught and killed in Abbottabad. (AP)A Pakistani youngster shows metal pieces collected from the wheat field outside a house, where al-Qaida leader Osama bin Laden was caught and killed in Abbottabad. (AP)New York City police officers with Operation Hercules arrive at the Armed Forces recruitment center in New York's Times Square. (AP)Armed Metropolitan Transportation Authority police officers and city police officer stand among the travelers in New York's Grand Central Station. (AP)