(CNN) -- Manchester United manager Alex Ferguson was left raging after claiming Robin van Persie "could have been killed" following an altercation with Swansea's Ashley Williams. Ferguson, whose side moved four points clear at the top of the English Premier League table following Sunday's 1-1 draw, accused Williams of deliberately kicking the ball at the striker's head while he lay on the ground. Van Persie and Williams squared up to each other following the incident as both sets of players tried to break up the confrontation. Blog: Has Ferguson gone too far? Referee Michael Oliver booked both men, but Ferguson wants the Football Association to take action against the Wales defender.
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Manchester United boss Alex Ferguson believes Robin van Persie "could have been killed"
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Dutch striker hit in head with ball while on the ground after Ashley Williams kicked ball away
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Patrice Evra's goal canceled out by Michu's strike as United held 1-1 by Swansea
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Chelsea crushes Aston Villa 8-0 to move into third position in English Premier League
@placeholder was quick to play down the incident after the game.