Iran has released an American-born journalist jailed for spying for the United States after a court reduced her sentence.

Roxana Saberi was sentenced to eight years in prison last month, but Monday's ruling saw that cut to a two-year suspended sentence.

"I'm okay. I don't want to make any comments but I am okay," she said shortly after walking out Of Tehran's Evin prison. She was then then driven away by her father.

Barack Obama, the US president, welcomed what he called a "humanitarian gesture" by Iran.