An eyewitness said emergency servics, including a helicopter, swarmed the Woodfield Plantation estate following reports shots were fired at The Maple Tree pub, Woodfield Way at around 9pm.
The witness said: 'There's a lot of talk that somebody has shot into the pub and there are loads of police.'
Another eyewitness said a car drove past the pub and fired shots through the window and shot a man sat inside the pub.
She said the victim was a 21-year-old man and he has been taken to hospital.
South Yorkshire Police said its officers were dealing with a '˜serious incident' at the pub.
We have asked for more information and are awaiting a response.
More to follow.