A British Special Air Service (SAS) sniper killed four ISIS fighters with a single bullet early last month, according to the Mirror. The militants were reportedly preparing to execute a dozen hostages with a flamethrower when the sniper fired the “life-saving” shot — from over 4,900 feet away.

The marksman — who is part of a British and US special forces team tracking “high-value” ISIS leaders in Syria — fired a shot at the flamethrower’s fuel tank, causing it to detonate. The explosion reportedly turned the ISIS executioner into a “human fireball.” Three other Islamic State fighters who were to film the executions perished alongside him. All 12 hostages were rescued by special forces.

Special Forces snipers had received a tip regarding the executioner’s location. They tracked him to a town near Raqqa, where he was getting ready to assassinate eight male and four female hostages. A source told the Mirror, “The executioner gave some sort of rambling speech over a loud hailer then when he finished the SAS sniper opened fire. The bullet struck the fuel container and it exploded immediately. He was incinerated and several of his henchmen were also killed.”

Special forces snipers have been taking out high ranking ISIS members with a vengeance this year. In February, a British SAS sniper took out an ISIS commander in Syria while he was teaching students how to decapitate enemies. Last December, an SAS sniper used only three bullets to kill five ISIS fighters in Iraq. But attacks aren’t only coming from British and American troops: the “Daesh Killer” is said to have shot down at least four ISIS leaders this year in Libya and Syria.

(Via Mirror)