The U.S. State department evacuated personnel and issued a strong travel warning to U.S. citizens in Yemen over concerns of a \"threat stream\" emanating from the Arabian Peninsula. Spokeswoman of the US Department of State Jen Psaki said in a statement Tuesday that the reduction of the number of emergency U.S. government personnel was in response to a \"threat stream indicating the potential for terrorist attacks against U.S. persons or facilities overseas.\" Nearly 100 personnel were reportedly airlifted out of Sanaa, capital of Yemen, today and were taken to the American air base in Ramstein, Germany. The Department of State urged all Americans in the country to leave immediately because of an \"extremely high\" threat of a terrorist attack. \"U.S. citizens should limit nonessential travel within the country, be aware of their surroundings whether in their residences or moving about, making their own contingency emergency plans, enroll their presence in Yemen through the Smart Travelers Enrollment Program and provide their current contact information and next-of-kin or emergency contact information,\" Psaki said. The evacuation follows a U.S. drone attack in Yemen that reportedly killed four al-Qaeda members.