The U.S. Department of State has issued travel warning for its citizens as the country marks the 10th anniversary of the September 11, 2001 terrorist attacks on World Trade Center in New York.

“The Department of State informs U.S. citizens traveling and residing abroad of the continued threat posed by Al Qaeda and its affiliates,” it said in an advisory statement on Friday.

The department though confirmed that they have not identified any specific threats from the Al Qaeda terrorist group affiliates and allies to attack the United States on the 9/11 anniversary.

However, it still warned U.S. citizens to be aware that Al Qaeda affiliates and allies have demonstrated the intent and capability to carry out attacks against the United States and the country’s interests around the world. “In the past, terrorist organizations have on occasion planned their attacks to coincide with significant dates on the calendar.” 

The worldwide travel alert is in effect from Sept. 2, 2011 and expires on Jan. 2, 2012.

The 9/11 attack reduced the World Trade Center to ashes, killing nearly 3000 men, women and children. New York will mark the 10th anniversary of the attack on the World Trade Center on Sept. 11, 2011 with ceremonies.

While the construction of a new World Trade Center is underway near the site of the former World Trade Center complex in New York's Lower Manhattan, the original site is now the National September 11th Memorial and Museum.

The 9/11 Memorial is scheduled to be dedicated on the 10th anniversary of the attacks on the World Trade Center amid high security alert.

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Combination photo shows hijacked United Airlines Flight 175 as it approaches and impacts the World Trade Center's south tower bursting into flames and raining a hail of debris on lower Manhattan in New York September 11, 2001. REUTERS/Sean Adair