Washington:
President Barack Obama will observe the 12th anniversary of the terrorist attacks on the World Trade Center and the Pentagon with a moment of silence and a visit to the Pentagon Memorial.
Obama on Wednesday will join first lady Michelle Obama, Vice President Joe Biden, Jill Biden and members of the White House staff in a moment of silence on the White House South Lawn.
The president will then attend a Sept. 11 observance at the Pentagon.
In the afternoon, Obama will take part in a service project to commemorate the National Day of Service and Remembrance.