Volunteers are taking center stage at ceremonies this year to mark the eighth anniversary of the Sept. 11 terrorist attacks.
More than 100 volunteers who worked at the World Trade Center site after the 2001 attack will read names of victims at Friday's ceremony near ground zero in New York. Vice President Joe Biden is expected to attend.
In Washington, President Barack Obama will meet with family members of the dozens killed at the Pentagon. Former Secretary of State Colin Powell will speak at a ceremony in western Pennsylvania, where one of four hijacked jetliners crashed.
It's the first year Sept. 11 has been declared a national day of service. Americans planned beach cleanups, packages for soldiers and fundraisers.
Meanwhile, federal officials are telling police to be vigilant on the anniversary of the Sept. 11 attacks, though they say it is routine advice.
Today is the eighth anniversary of the jetliner crashes that killed nearly 3,000 people in the U.S. The FBI and Homeland Security Department sent a bulletin to law enforcement agencies nationwide Thursday evening, a copy of which was reviewed by The Associated Press. The bulletin is similar to past advisories on holidays and other significant dates, and gives no indication of any specific threat. It reminds police that terrorists in other countries recently have attacked public business sites like hotels. Justice Department spokesman Richard Kolko said issuing the bulletin is routine.