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Police and forensic experts work on February 1, 2013 at the site of a blast outside the US Embassy in Ankara. Two security guards were killed in the blast outside the US embassy, local television reported, amid speculation it was a suicide attack. The force of the explosion damaged nearby buildings in the Cankaya neighborhood where many other state institutions and embassies are also located.  AFP PHOTO / ADEM ALTAN        (Photo credit should read ADEM ALTAN/AFP/Getty Images) Adem Altan/AFP/Getty, ADEM ALTAN