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Det Ch Supt James Dunkerley, heading the unit, added that officers were "working at pace to establish the full facts and circumstances of Saturday's incident".

Det Ch Supt James Dunkerley said on Saturday there was no evidence to suggest anyone else was involved in the attack and they "were not looking for anyone else in relation to the incident".

Det Ch Supt David Ferry said the arrests highlighted the ongoing efforts to catch those responsible.

Det Ch Supt Ferry said a "good response" from the public to recent appeals for information had led to some of the arrests and thanked people for their help.