Violence erupted at the end of the sides' Carling Cup quarter-finala month ago. A late winning goal from Nikola Zigic prompted hundreds ofdelighted Birmingham fans to invade the pitch.
Call for calm: Birmingham goalkeeper Ben Foster
Riot police intervened when many fans surged towards the Villa support. Flares and broken seats were flung between thesupporters and it took over 10 minutes for police to move the crowd off the St Andrew's turf.
Foster said: 'There was a lot of tension and a late goal but you never want to see things like that.
'When we saw our fans run on the pitch at full time you could see the jubilation on their faces. But we went into the changing rooms and all we could see was trouble. 'It's scary when you have a couple of hundred fans running at you.'
After Stevenage won 3-1 over Premier League Newcastle, Scott Laird was floored by a punch from one his own fans. Foster said: 'You don't know what could be going on. Someone might have a knife.'
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