Abu Bakr al-Baghdadi, the Iraqi national who founded and led the Islamic State of Iraq and Syria (ISIS), was killed in a violent raid in Syria, President Donald Trump announced Sunday morning. According to the president, al-Baghdadi died after “running into a dead end tunnel” in his Syrian compound with three of his children, igniting an explosive vest that killed all four as American military dogs closed in. “He died like a dog,” Trump said. “He died like a coward. The world is now a safer place.” Trump credited local allies, including the Russians, Iraqis and Kurds, for intelligence gathering and material military support. New developments came Tuesday as Trump tweeted that the next in line to succeed al-Baghdadi — Abu Hassan al Muhajir, according to The Washington Times — has been “terminated” by U.S. troops. ISIS rose to prominence in the middle of the decade, and were declared a terrorist group by the United Nations in 2014. The group is known in part for their high-profile use of internet propaganda, including the sharing of videos of executions on social media.