Citing "increased terrorist threats" from militant groups in various regions of the world, the U.S. State Department issued a global travel alert on Monday following deadly militant attacks in France and Mali.
As millions of Americans prepare to travel for the U.S. Thanksgiving holiday on Thursday, the agency said potential attackers could target private or government interests.
"Current information suggests that (Islamic State), al-Qaeda, Boko Haram, and other terrorist groups continue to plan terrorist attacks in multiple regions," the State Department said in a warning posted on its website.
Although it did not mention the Nov. 13 Paris attacks claimed by the Islamic State group in which 130 died, the department noted that militants had carried out attacks in France, Nigeria, Denmark, Turkey, and Mali during the past year.
"Authorities believe the likelihood of terror attacks will continue as members of (Islamic State) return from Syria and Iraq," it said. "Additionally, there is a continuing threat from unaffiliated persons planning attacks inspired by major terrorist organizations but conducted on an individual basis.
France and Belgium have launched a manhunt following the attacks in Paris, with a focus on Brussels barkeeper Salah Abdeslam, 26, who returned to the city from Paris hours after the attacks and is still at large.
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(Reporting by Arshad Mohammed; Editing by Eric Walsh)