SANAA (AFP) - Unidentified gunmen shot dead a military adviser to Yemen's defence ministry, an Iraqi national, in Sanaa on Tuesday, a security official said. Speaking on condition of anonymity, the official said the victim, Khaled Hatem al-Hashemi was killed when "two gunmen on a motorbike" fired "two bullets" into his head as they drove past him. He said the assailants managed to escape. It is believed that many Iraqi army officers who served under Saddam Hussein fled to Yemen after the fall of his regime and took jobs as military and defence advisers to the Yemeni govt. So far, no one has claimed responsibility for the killing but Qaeda has been blamed for a spate of attacks on Yemeni security officials, throughout the country.