Conversation so far:
What was the Alf-Inge Håland incident involving Roy Keane?
Roy Keane made headlines again in the 2001 Manchester derby, when he was sent off for a blatant knee-high foul on Alf-Inge Håland.
What year did Roy Keane getting sent off for a blatant knee-high foul on Alf-Inge Håland occur?
Roy Keane made headlines again in the 2001 Manchester derby, when he was sent off for a blatant knee-high foul on Alf-Inge Håland.
What was Roy Keane's punishment for a blatant knee-high foul on Alf-Inge Håland?
Roy Keane initially received a three-match suspension and a £5,000 fine from The Football Association, but further punishment was to follow.
How did the soccer officials punish Roy Keane further for a blatant knee-high foul on Alf-Inge Håland other than the initial three-match suspension and £5,000 fine from The Football Association?
Roy Keane was banned for a further five matches and fined £150,000 in the ensuing investigation.

Question: Why did he attack the player?
Self-contained rewrite: Why did Roy Keane attack Alf-Inge Håland?