A four-year-old boy has been knocked down.
He has been rushed to Leeds General Infirmary and is currently undergoing treatment after he was struck outside the Head of Steam pub in St George's Square.
Police said that a taxi was involved in the collision, which occurred at 4.05pm.
One ambulance, an emergency responder and police were called to the scene.
About 25 foot of the road leading from Railway Street into the square is still taped off by police, who are investigating what happened.
DI Steph Wisemann said: "We believe a taxi was involved.
"The road is still closed."
Commenting on the victim's condition, a spokesman for West Yorkshire Police said: "He is undergoing treatment but there is no indication that he has suffered life threatening injuries."
