"Consistent with section 202(d) of the National
Emergencies Act, 50 U.S.C. 1622(d), I am continuing for
1 year the national emergency previously declared on
September 14, 2001, in Proclamation 7463, with respect
to the terrorist attacks of September 11, 2001, and the
continuing and immediate threat of further attacks on
the United States.
Because the terrorist threat continues, the national
emergency declared on September 14, 2001, and the
powers and authorities adopted to deal with that
emergency must continue in effect beyond September 14, 2010."
Federal Register, Notice of September 10, 2010, Continuation of the National Emergency With Respect to Certain Terrorist Attacks.
The 2nd time President Obama has extended the state of national emergency that has been in continuous effect since September 14, 2001.
The National Emergencies Act (50 U.S.C. 1601-1651), limits any such declared emergencies to two years.