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Carlisle United have passed on CCTV footage of a fan who let off a firework during Saturday's home defeat by Leyton Orient to police.

The incident occurred in the Warwick Road End before half-time.

It is the second time this season that the club have had to deal with an incident from that end of the ground after fans threw objects on to the pitch against Fleetwood in August.

Carlisle urged those responsible to "come forward now".

"Footage checked. We can confirm it shows the incident with the firework. It has been passed to the police who will seek to identify those involved," the League One club wrote on social media.

"If those responsible come forward now, we would welcome that before the knock on the door and more serious action is necessary."

Chief executive Nigel Clibbens said the incident had

"I have seen numerous comments on social media from supporters who were close by, and I started to receive emails on Sunday morning from people near to it who were extremely upset, to the point of saying they wouldn't be coming back," he said.

"If you know who did it, or know of anyone who was responsible for the incident, please help us to identify them and deal with them for the good of the club."

He added: "As I said in my last update with the Carlisle United Supporters' Groups, we were due an FA inspection to assess our fan behaviour following previous incidents and the most recent fine.

"That took place on Saturday. An FA inspector was at the game. It's an obvious understatement to say that this doesn't help us at all. The club and many thousands of fans have been let down by this."