For President Trump, it's decision time.
Ten days ago, he said the US was prepared to go to the "rescue" of Iranian protesters if their government used violence against them.
The US was, the president said, "locked and loaded and ready to go".
That was before the violent crackdown in Iran had really begun. Now, with its full extent being shockingly revealed, the world waits to see how Trump will respond.
"Nobody knows what President Trump is going to do except for President Trump," White House Press Secretary Karoline Leavitt said. "The world can keep waiting and guessing."
