The State Department on Friday issued a global travel alert for U.S. citizens, warning of an Al-Qaeda terror threat for the entire month of August.
The travel alert comes after 21 embassies across the Muslim world were ordered closed due to an unspecified threat.
"Current information suggests that al-Qa’ida and affiliated organizations continue to plan terrorist attacks both in the region and beyond, and that they may focus efforts to conduct attacks in the period between now and the end of August," the alert posted on the State Department's website stated.
The alert warned of the "potential for terrorist attacks" particularly in the Middle East and North Africa, and also possibly in the Arabian Peninsula.
"Terrorists may elect to use a variety of means and weapons and target both official and private interests," the alert said. "U.S. citizens are reminded of the potential for terrorists to attack public transportation systems and other tourist infrastructure. Terrorists have targeted and attacked subway and rail systems, as well as aviation and maritime services. U.S. citizens should take every precaution to be aware of their surroundings and to adopt appropriate safety measures to protect themselves when traveling."
This post has been updated.