At least 18 soldiers and security guards are killed in Yemen in attack on intelligence headquarters in Aden.<br/> <br />Officials say they believe more bodies are believed to buried under the rubble of the building,<br/> <br />The United States has been pouring aid into Yemen to stem the threat of attacks from al Qaeda in the Arabian Peninsula and to try to prevent<br/> <br />any spillover of violence into neighboring Saudi Arabia, the world's top oil exporter.
