Fabregas (second from right) and Horton (third from the left) experience different emotions on the pitch after the match
Hull City manager Phil Brown accused Arsenal's Cesc Fabregas of spitting at his assistant Brian Horton at the end of their stormy FA Cup quarter-final.
Arsenal scored twice late on to win 2-1 at the Emirates and seal a last-four date against Chelsea at Wembley.
Brown said: "For their club captain Cesc Fabregas to spit at my assistant at the end of the game shows you what this club is all about."
Fabregas, who was out injured, later strenuously denied the allegation.
"I categorically deny that I spat at anybody after the match," said the 21-year-old Gunners midfielder.
"I have never done this in my whole career on the pitch, so why would I do it when I am not even playing?
"I can understand the frustration of losing a game to a dubious goal - that has happened to me many times in my career as well - but this is not the fault of me or any of the Arsenal players."
Arsenal manager Arsene Wenger said he knew nothing about the incident.
"I know nothing about that at all. I'm not a specialist to create newspaper stories or to create things that are minor that might have happened in the tunnel. I'm sorry, I can't speak about something I haven't seen," stated Wenger.
Fabregas, who is recovering from knee surgery, joined his team-mates on the pitch at the final whistle after two goals in the last 16 minutes from Robin van Persie and a disputed header from William Gallas cancelled out Nick Barmby's early strike.
Brown added: "I was there and I witnessed it, he spat at my assistant manager down the tunnel, that's their club captain. Hopefully he's proud of himself. He spat at his feet."
Hull's boss was furious after the defeat, accusing referee Mike Riley and his officials of succumbing to pressure from Arsenal and boss Wenger - and the game ended without the two managers shaking hands.
Brown claimed: "The game was turned on its head when the referee succumbed to local pressure."
He also condemned his Arsenal counterpart's behaviour as the Emirates crowd taunted Hull for what they saw as time-wasting.
He said: "Mr Wenger decides to join in and the result is my goalkeeper getting booked in the second half.
We have been beaten by a linesman's decision and a referee's decision for Gallas' goal
Hull manager Phil Brown
"Arsene Wenger got my goalkeeper booked. You call that good management? He was complaining about time-wasting. It's an absolute disgrace."
Asked about Wenger's failure to shake his hand at the final whistle, Brown said: "He never does."
Brown insisted: "We haven't been beaten by Arsenal, and they are fourth top of the Premier League. We have been beaten by a linesman's decision and a referee's decision for Gallas' goal."
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