Hundreds of protesters outside Blackpool FC staged a major demonstration over the running of the club by chairman Karl Oyston.
Police said a protest which started peacefully at 2.30pm on Saturday developed prior to the Blackpool v Brighton kick off on Saturday.
Supporters – frustrated at lack of investment at the club - said up to 1,000 people are thought to have taken part in the demonstration, although police believed the number to be nearer 300.
A number of people tried to gain entry to the main recpetion area and a smoke flare was set off.
Lancashire Police said no arrests have been made but they will now be reviewing CCTV.
Officers also provided a presence outside the stadium after the game.
It is understood the protest - by supporters who are furious at a lack of investment in the team since the club received millions in payments following relegation from the Premier League - initially involved 150 people, before hundreds more joined.
Police said after the drama at the main reception area just before kick off, the majority of the protesters dispersed into the ground while the others held a peaceful protest by the hotel entrance.
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