Question

How did Iran respond when the U.S. refused to hand over Shah Mohammad Reza Pahlavi following the Iranian Revolution?

Answer 1

The Iranian group seized fifty-two Americans (from the American Embassy based in Iran) and held as hostages as a response to the United States when they refused to hand over Shah Mohammad Reza Pahlavi which also lead into an Iranian Revolution. 

Answer 2

it seized fifty-two American hostages.