Rushdie was about to give a speech in western New York when he was attacked by a group of people.
An AP reporter witnessed a man attack Rushdie as he was being introduced. The man was restrained after he fell to the floor.
Rushdie was surrounded by a small group of people who were holding up his legs.
His condition was unknown at the time.
Hundreds of people were in the audience when the attack happened.
Since 1988, Rushdie's book "The Satanic Verses" has been banned in Iran because of its content. The fatwa was issued by the leader of Iran.
There is a bounty on the head of anyone who kills Rushdie.
Iran's government distanced itself from Khomeini's decree, but anti-Rushdie sentiment still persists. The bounty for Rushdie was raised in 2012 to more than $3 million.
Rushdie said there was no evidence that people were interested in the reward.
Rushdie wrote a book about the fatwa. Rushdie used a different name while in hiding.
Rushdie rose to prominence with his Booker Prize-winning 1981 novel "Midnight's Children" but his name became known around the world after "The Satanic Verses."
The summer lecture series is held at the Chautauqua Institution, which is located 55 miles southwest of Buffalo. There was a time when Rushdie spoke there.