At half time the score stands at Blackburn 0 - 1 Cardiff after a goal from Mark Hudson.
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They have been arrested on suspicion of perverting the course of justice and have since been released on bail.
North Wales Police said no one was injured, but they received a call saying there was a man with a firearm in Amlwch.
A mother has been reunited with her 4ft-long pet snake, which went missing four months ago.