The US government has issued a worldwide travel alert - warning its citizens of the risks of traveling because of “increased terrorist threats”.

In a message posted on its website, the State Department warned on Monday evening that people should be more vigilant after recent attacks in France and Mali.

“Current information suggests that (Islamic State), al-Qaeda, Boko Haram, and other terrorist groups continue to plan terrorist attacks in multiple regions,” it said,

Travel Alert: Authorities believe likelihood of terror attacks will continue as ISIL/Da’esh return from Syria/ Iraq. https://t.co/Ebm8Ny3Bom

“Authorities believe the likelihood of terror attacks will continue as members of ISIL/Da’esh return from Syria and Iraq. Additionally, there is a continuing threat from unaffiliated persons planning attacks inspired by major terrorist organizations but conducted on an individual basis.  

“Extremists have targeted large sporting events, theatres, open markets, and aviation services.  In the past year, there have been multiple attacks in France, Nigeria, Denmark, Turkey, and Mali.  ISIL/Da’esh has claimed responsibility for the bombing of a Russian airliner in Egypt.” 

The alert from Washington comes after the attacks in Paris that left more than 130 dead and the assault upon a hotel in Mali.

The warning urged people to "exercise vigilance when in public places or using transportation"

It added: "Be aware of immediate surroundings and avoid large crowds or crowed places.  Exercise particular caution during the holiday season and at holiday festivals or events."