The US has issued a worldwide travel alert to its citizens, citing terrorist threats from Isis, al-Qaeda, Boko Haram and "other terrorist groups".
The alert from the US State Department urges US citizens to exercise caution in public places and during holidays and public events.
French President Francois Hollande will meet Barack Obama at the White House on Tuesday to discuss the fight against so-called Islamic State.
Malaysian prime minister Najib Razak has condemned the so-called Islamic State group as "evil" terrorists, and says his Muslim-majority country is ready to join others to defeat it.
But he warned that a military solution alone was not enough, arguing their ideology needed to be "vanquished".
"This is how Gandhi, Nelson Mandela and Martin Luther King won the hearts and minds of their enemies. They won by transforming their foes into friends."
His comments come after a number of attacks claimed by the group and other Islamist militants, responsible in recent weeks for the downing of a Russian plane, attacks on Paris and Beirut and an armed raid and hostage situation in a popular hotel in Mali on Friday.
France and the US have agreed to step up airstrikes in Syria and Iraq to target IS in the wake of the Paris attacks.
Britain will do "all in our power" to support France in the fight against IS following the Paris terror attacks, David Cameron said.
The United Nations Security Council agreeS to intensify efforts to 'eradicate' Islamic State in the wake of the Paris terror attacks.