The State Department issued a worldwide caution to warn U.S. citizens of the threat of terrorism.
"Current information suggests that al-Qaida, its affiliated organizations, and other terrorist organizations continue to plan terrorist attacks against U.S. interests in multiple regions, including Europe, Asia, Africa, and the Middle East," the warning reads.
In Europe, the State Department took note of early February attacks on the U.S. Embassy in Ankara. An embassy guard was killed in an attack by a left-wing militant group there.
The State Department warned that al-Qaida groups across the Middle East continue to pose a threat to U.S. interests.
"Attacks may employ a wide variety of tactics including suicide operations, assassinations, kidnappings, hijackings and bombings," the State Department warned.