The do-it-yourself model was professionalized and has been really deployed around the world by ISIS, inspiring dozens of people to carry out attacks in their name,” one expert tells NBC News.

Last Saturday, an Islamic State infiltrator ambushed a meeting between American soldiers and their local counterparts in a Syrian desert town. Two members of the Iowa National Guard and a U.S. civilian interpreter were killed in the assault—whose perpetrator may or may not have known that the subject of the meeting was how to counter ISIS.

The attack, which took place in the city of Palmyra, comes a year after the fall of Syrian President Bashar al-Assad and the lifting of U.S. sanctions.

Australian officials say the suspects were motivated by ISIS. It suggests the group may still have the ability to inspire acts of terrorism.

The men suspected of attacking a Jewish gathering on Bondi Beach were inspired by the ISIS terror group and spent weeks last month in the Philippines, officials say.

A decade ago, the self-proclaimed Islamic State group held vast swaths of territory across Iraq and Syria, but President Trump declared it destroyed in 2019.

The United States began major airstrikes against the Islamic State in Syria on Friday, fulfilling President Trump’s vow to avenge the deaths of two U.S. Army soldiers and a civilian U.S. interpreter killed in a terrorist attack in the central part of the country last Saturday.

European authorities disrupt multiple terrorist plots ahead of Christmas celebrations, including ISIS-inspired bombing plan in Poland and arrests in Germany.