How to help
Flag flying guide
Post a tribute to someone killed in the attack or write condolences to all victims in the National Book of Remembrance.
A changed America?
Acts of patriotism
Anyone with information regarding the attacks should call the FBI at this number:
Leave a tip online
The IRS has set up a website and a toll-free number to help people having trouble with taxes as a result of the Sept. 11 attacks.
Call 866-562-5227, weekdays, 7 a.m. to 10 p.m.