A security official at the United States embassy in Yemen\'s capital city of Sanaa was shot dead by two masked men on a motorcycle Thursday. Qassem Aqlani, 50, was ambushed on his way to work. Yemeni security sources have told media in the US that the murder \"has the fingerprints of al-Qaeda\". Aqlani worked for the US embassy in Yemen for about 20 years, and had recently been investigating a September 12 assault on the embassy amid the outrage over a US-produced anti-Islamic film.