FILE - In this Feb. 26, 1993 file photo, a police officer assists a survivor of the World Trade Center terrorist bombing in New York. On Thursday, Feb. 26, 2015, officials at the Sept. 11 museum will mark the 22nd anniversary of the 1993 World Trade Center bombing that killed six people and injured more than 1,000. (AP Photo/Marty Lederhandler, File)