US worried about terrorist attacks on the rare closure of some embassies and consulates

The U.S. State Department on the 1st suddenly announced, for fear of terrorist attacks, some U.S. embassies and consulates will be in the 4th (周日) stop office, these temporary closed and consulates are mainly distributed in the Middle East, North Africa and South Asia, but U.S. does not rule out let in Europe and Latin America and consulates Foreign office also temporarily stopped. 2, the U.S. Embassy in Egypt announced that from that day onwards, closed three days.
British Broadcasting Corporation on the 2nd quoted senior officials as saying the U.S. State Department, the U.S. State Department did not specify which embassies and consulates will be closed, nor does it explain what kind of threats facing these consulates. The official explanation is that the U.S. State Department after receipt of the relevant information to take preventive measures.
CNN 2, 2009, said on Sunday closed the U.S. Embassy or Consulate in countries including Israel, Jordan, Kuwait, Libya, Saudi Arabia, Yemen, Afghanistan and other countries. White House officials said the United States also have national prevention severity of the points, the security situation will change anytime in Yemen, the United States is firmly fixed location; near future may set off more large-scale violence in Egypt, is also considered to be worried about the U.S. countries.
However, the British “Daily Mail” reported on the 2nd, said the MENA region of the U.S. embassies and consulates have always been treacherous. Like the U.S. consulate in Benghazi was attacked last year, resulting in the United States Ambassador to Libya, including four people were killed. In 1998, the U.S. embassies in Tanzania and Kenya almost simultaneously by a car bomb attack. In addition, not only for the U.S. extremist groups embassies attack, some other institutions are also being targeted.