Palestinian militant group Hamas’ top political leader, Ismail Haniyeh, was killed Wednesday by a predawn airstrike in the Iranian capital of Tehran, Iran and the militant group said, blaming Israel for the shock assassination.

Iran’s supreme leader vowed revenge against Israel.

On this week’s episode of “The Hunt with WTOP national security correspondent J.J. Green,” Hans-Jakob Schindler, senior director at the Counter Extremism Project, talks about what happened.

The Associated Press contributed to this report.