THE US State Department has issued a worldwide travel alert for Americans citing possible risks due to increased terrorist threats.

The warning comes following deadly attacks in Paris claimed by the Islamic State, which left more than 120 individuals dead. The department did not mention the incident in its alert, but suggested that militants associated with the Islamic State, al-Qaeda, Boko Haram and other terrorist groups are continuing to plan terrorist attacks in multiple regions.

“Authorities believe the likelihood of terror attacks will continue as members of [Islamic State] return from Syria and Iraq,” the department said. “Additionally, there is a continuing threat from unaffiliated persons planning attacks inspired by major terrorist organizations but conducted on an individual basis.”

The department did not suggest that people stop traveling, but urged citizens to exercise vigilance in public places and when using transportation. It also advised individuals to be aware of their immediate surroundings and avoid large crowds or crowded places.

Extremists have targeted large sporting events, open markets, aviation services and theaters, the department said. Multiple attacks have occurred in the past year in France, Nigeria, Denmark, Turkey and Mali.

In addition to the recent Paris attacks, the Islamic State has also claimed responsibility for the bombing of a Russian airliner in Egypt on Oct. 31, which resulted in the deaths of more than 224 people.

The travel alert will remain in effect until Feb. 24, 2016.