Aston Villa have apologised for the pitch invasion at the end of the FA Cup quarterfinal, an incident which their own player Fabian Delph called "very, very scary."
The Football Association is set to launch an investigation after after two pitch invasions at the end of their 2-0 victory over West Brom.
Seats were thrown from the Albion fans and a pitch invasion delayed the game before Villa fans ran onto the surface again at the final whistle.
Press Association reported the FA had a crowd control advisor at the game who will advise the organisation's decision.
Both teams were surrounded by fans and midfielder Delph, who scored his first goal for a year to give Villa the lead, admitted it was unnerving.
"Very, very scary," he told the BBC. "My armband got nicked, someone got my left boot, but I could appreciate the relief the fans are feeling after a result like that.
"It was dangerous. Someone tried to take my boot off. People tried to kiss me and were biting me. It was scary."
In the second half there were a number of seats thrown from the upper tier of the North Stand, where Albion fans were sitting, down on home supporters below.
Villa said sorry for the problems which they believe marred the celebrations.
"The club does not condone supporters invading the field of play under any circumstances," a statement read. "We are very disappointed that what should have been a very memorable and proud moment for our fans was marred by the actions of those who could not control themselves. "They have let both themselves and their club down.
"The club extends its sincere apologies to the Football Association, the West Bromwich Albion directors, manager Tony Pulis and all his staff and players."
Albion boss Tony Pulis insisted Villa should have recognised the potential problems ahead of the game.
He said: "I actually think Villa should look at the stewarding. It's a quarterfinal of the FA Cup, a full house, you know it's going to be testy. You should have stewards but the hierarchy at Villa should recognise the need for stewards both ends of the pitch.
"It puts the players at danger and we don't want to see that. We were seeing it in the 1970s and 80s and we don't want to get back to that.
"I'm sure the FA will look at it without me poking my nose in too much."
Pulis confirmed his players were fine after the incidents.
He said: "Everyone looked as though they had their heads on, their arms on and their legs on. Nobody said anything to me. "I'm sure Villa are disappointed that it's happened."
Tim Sherwood defended the hosts' stewarding -- despite fans lining up on the side of the pitch before the end -- and insisted emotions were running high.
"What can you do? The stewards did their best, I saw them rugby tackle a few guys, but when they are coming on in such numbers it's difficult to stem it," he said.
"I can't condone the fans entering the field, but I have to be totally honest I can understand their emotions, they've just beaten their local rivals twice in a week and once in the quarterfinal of the FA Cup, so the emotions are running very, very high.
"But like I say, the club wouldn't condone that sort of action, especially if anyone was touched."
West Brom keeper Ben Foster appealed to fans on Twitter:
PLEASE jus get home safe everyone. Stupid scenes..
- Ben Foster (@BenFoster) March 7, 2015
Sherwood added: "It's huge and the players want to dedicate it to the fans, the fans have had some hard times here and everyone at the club realises we need them."
On the pitch Scott, Sinclair wrapped up the win with a second goal after Claudio Yacob had been sent off for the Baggies after a challenge with Leandro Bacuna. Villa's Jack Grealish was also dismissed in injury time after collecting a second yellow card for diving
Pulis said of Yacob: "That's not a sending off.
"Yac has had three touches before he blows up. I thought the linesman had said something but I have spoken to Anthony [Taylor, the referee] and he has made the decision.
"I don't know what Grealish got sent off for, I was amazed when he showed him the red card."