Iran accuses Israel of the murder of Mohsen Fakhrizadeh, a key scientist in the Persian regime's nuclear program, although Tehran has yet to present any evidence.
The incident adds even more tension in that part of the world, as Iran has promised to respond to the attack in a forceful manner.
The office of Israel's Prime Minister Benjamin Netanyahu has declined to comment.
But what do we know about the attack?
Was it done with a remotely controlled machine gun as different Iranian agencies point out?
This is what we know.