A Leeds fan ran onto the pitch following their equalising goal and pushed Sheffield Wednesday's goalkeeper, Chris Kirkland, who fell to the ground with both hands to his face.
Kirkland seemed shaken but was OK as the game resumed.
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A hooligan who ran on to the pitch and assaulted a goalkeeper during a Championship football match has been identified by police.
South Yorkshire Police have vowed to work with Leeds United and Sheffield Wednesday to find the fan who assaulted goalkeeper Chris Kirkland.