[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/POLITICS/01/23/gitmo.detainee/art.gitmo.filer.gi.jpg caption="Ali al-Shiri was released in 2007 from the U.S. detention facility at Guantanamo Bay, Cuba."]
A Saudi national released from U.S. detention at Guantanamo Bay, Cuba, in September 2007 is believed to be a key leader in al Qaeda's operations in Yemen, according to a U.S. counterterrorism official.
The Defense Department recently estimated that more than 60 terrorists released from Guantanamo may have returned to the battlefield.
According to the counterterrorism official, freed detainee Ali al-Shiri traveled to Yemen after being released to Saudi Arabia and may have been involved in recent al Qaeda attacks in Yemen, including a car bombing outside the U.S. Embassy in Sanaa last year that killed nearly a dozen people.
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