This Sunday marks the 15th anniversary of the Sept. 11 terror attacks in lower Manhattan.

A somber ceremony is planned at the World Trade Center to honor the lives lost on the tragic day, and the city will be shutting down streets in the vicinity for several hours.

The following roads will be closed from 6 a.m. to 3 p.m., according to the city Department of Transportation.

All streets bordered by Barclay Street, Broadway, Battery Place and West Street.

Liberty Street between West Street and South End Avenue.

Albany Street between West Street and South End Avenue.

West Thames Street between West Street and South End Avenue.

South End Avenue between Liberty and West Thames streets.

Little West Street between West Thames Street and Battery Place.