In Lower Manhattan, New York City, a 24-year-old homeless man is charged with murdering four other homeless men and attempting to murder a fifth in random attacks. Authorities identify one of the deceased as an 83-year-old man, but release no further details about the victims.
The Police Department of Everett, Washington, identifies and returns the American flag from the September 11 attacks to Ground Zero, the World Trade Center site in New York City.
Eight people are injured (three seriously) in Lower Manhattan as a result of an explosion and partial collapse, of as-yet unknown cause, in a five-storey building, in Chinatown, Manhattan, New York City, on Pike Street, near Henry Street.
A SeaStreak ferry travelling to Lower Manhattan, New York City, crashes into the dock, injuring 85 people.
An agreement is reached allowing the completion of the US National September 11 Memorial & Museum on the World Trade Center site in New York City.
President of the United States Barack Obama visits the World Trade Center site in New York City to commemorate the victims of the September 11 attacks following the death of Osama bin Laden.
Thousands of people gather at Ground Zero of the September 11 attacks in New York to celebrate the news that Osama bin Laden has been killed.
Protesters against the Park51 project for an Islamic community center two blocks away from Ground Zero of the World Trade Center site gather in New York City.
David Paterson, Governor of the U.S. state of New York, is to discuss relocating the controversial Park51 Islamic community centre and mosque near World Trade Center site in New York City.
Two major US TV networks, CBS and NBC, censor the "Kill the Ground Zero Mosque" advertisement by conservative group National Republican Trust which calls plans to erect a mosque near New York City's Ground Zero a "monstrosity".