John McDougall, who was reporting from the match for the Press Association, said: "It was a feisty game - not a dirty one - and there was clearly local pride at stake.
"At the end of the game there was a pitch invasion and some of the Preston fans went over towards the Blackpool supporters in the away end.
"Police, both on foot and mounted, formed a wall between the two sets of fans. It took about five or 10 minutes for them to clear the supporters.
"Both managers have condemned the pitch invasion."
Lancashire Police have confirmed they are looking into the incident.