A 21-year-old British hacker who was a member of the Islamic State in Iraq and Syria (ISIS) was killed in a U.S. military airstrike earlier this week, the Pentagon confirmed Friday. "We can confirm that Junaid Hussain, an ISIS operative was killed in a U.S. military airstrike on August 24 in Raqqa, Syria," said Air Force Col. Pat Ryder, spokesman for U.S. Central Command.