US carries out 'massive' strike against IS in SyriaEPA/ShutterstockThe US says its military has carried out a "massive strike" against the Islamic State group (IS) in Syria, in response to a deadly attack on American forces in the country. Defence Secretary Pete Hegseth said Operation Hawkeye Strike was aimed at eliminating IS "fighters, infrastructure, and weapons sites". Fighter jets, attack helicopters and artillery hit multiple targets in central Syria, US officials told CBS, the BBC's media partner in the US. Aircraft from Jordan were also involved. President Donald Trump later said "we are striking very strongly" against IS strongholds, after the 13 December IS ambush in the city of Palmyra in which two US soldiers and a US civilian interpreter were killed. In a post on X late on Friday, Hegseth wrote: "This is not the beginning of a war - it is a declaration of vengeance. The United States of America, under President Trump's leadership, will never hesitate and never relent to defend our people."If you target Americans - anywhere in the world - you will spend the rest of your brief, anxious life knowing the United States will hunt you, find you, and ruthlessly kill you."Today, we hunted and we killed our enemies.