The U.S. Department of State has issued a global travel alert, particularly in the Middle East and North Africa, amid a perceived al-Qaeda threat of conducting attacks in the period between now and end of August.
According to the BBC, the State Department has recommended to U.S. citizens abroad to be vigilant about using public transportation systems and other tourist facilities.
The alert comes after the U.S. announced the closure of 14 American embassies in the Middle East and North Africa on Sunday.
U.S. President Barack Obama has ordered the taking of all appropriate steps to protect Americans after a threat of an al-Qaeda attack alert was generated by the intelligence agencies.