Four people were arrested at Elland Road as Leeds players and fans celebrated their Championship title triumph on Wednesday evening.
One police officer was also injured with the West Yorkshire Police force condemning supporters who threw missiles.
Despite Leeds owner Andrea Radrizzani and managing director Angus Kinnear asking fans to remain at home, thousands of supporters turned up outside the ground as their team beat Charlton 4-0 on the final day of the 2019/20 campaign.
Leeds players boarded a bus to join the celebrations after their pitchside trophy presentation finished. However, the jubilant scenes were marred by the arrests.
Superintendent Jackie Marsh, of Leeds District Police, said: “The safety of fans and the wider public has always been our primary concern and that is why we advised the safest way for people to celebrate in these times was in their own homes.
“However, it was anticipated that some fans would gather outside the ground last night to celebrate and a police operation was put in place to make sure that this was managed safely and effectively.
“This operation saw a total of four people arrested for public order offences. One officer received a minor injury which did not require hospital treatment.
“While most of those who gathered did so with good intentions, there were some missiles thrown which resulted in officers having to wear protective equipment.
“Assaults on police officers will not be tolerated and enquiries will be made to identify those responsible so appropriate action can be taken.”
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Leeds defended their decision to hold an open-top bus parade amid the coronavirus pandemic, which has killed more than 45,000 people in the UK.
A club statement read: “Following consultation with the SAG (Safety Advisory Group) and [Leeds City] Council, Leeds United arranged for a bus to be parked outside the East Stand reception as a contingency to assist dispersal should a crowd congregate at Elland Road, despite a month-long campaign from the club and supporter groups to encourage supporters to stay at home.
“The safety group believed that a brief appearance from the players with the Championship trophy would help to signal an end to proceedings, encouraging fans to head home safely.
“In challenging circumstances fan safety has always been our priority.”