Video of a recent suicide attack on government targets in northern Syria . Radical Islamists : One of the attackers is American , identified as Abu Omar . U.S. official : His tweet , which was published on the radical Islamist website Hanein , features the alleged American 's picture and the words , `` Abu Hurayra Al-Amriki performed a martyrdom operation in Idlib , Jabal Al-Arba'een . Man likely had an American connection , but it 's not fully confirmed . U.S. officials have expressed concerns about continued violence in Syria .
Video of a recent suicide attack on government targets in northern Syria . Radical Islamists : One of the attackers is American , identified as Abu Omar . U.S. official : Man likely had an American connection , but it 's not fully confirmed . U.S. officials have expressed concerns about continued violence in Syria .