A female police officer suffered serious head injuries during the celebrations by Leeds United fans in the city on Sunday.
Thousands of supporters gathered in Millennium Square after the clubs promotion to the Premier League was secured.
Leeds fans gathered in Millennium Square to celebrate their promotion
Almost 7,000 people were said to have attended
It was confirmed over the weekend that Leeds would go up as champions following 16 years outside the top flight.
As fans gathered to celebrate in the city on Sunday, a small minority of people threw bottles at the police and caused unrest.
West Yorkshire Police revealed that nine people were arrested for public order offences.
A number of officers suffered injuries, with one officer left in a serious condition.
Leeds United were promoted to the Premier League as champions
Assistant Chief Constable of West Yorkshire Police, Oz Khan, said: Throughout the weekend, fans have gathered across Leeds to celebrate the promotion of Leeds United into the Premier League.
We have continued to impress upon fans the importance of the COVID-19 Government guidance and our approach has primarily remained as one of engagement and encouragement.
“On Sunday (July 19), almost 7,000 people gathered in Millennium Square in Leeds; whilst the vast majority of fans were enjoying themselves and celebrating, there were a small minority of people who began to throw bottles at police officers.
“A female officer suffered a serious head injury and was taken to hospital for treatment, a number of other officers suffered minor injuries and a further 15 members of the public were injured.”