British police announced on Saturday that they had found no evidence to support bringing terrorism charges against anyone, following a suspected threat targeting an Islamic event held in eastern England last week.

Authorities arrested 13 people between Sunday and Thursday after receiving information about a 'potential serious threat' targeting the religious event, which was attended by around 15,000 people in Suffolk.

Police said that eight men were detained under terrorism laws, before seven of them were released without any charges.

In contrast, a 42-year-old man was charged with possession of offensive weapons, including an extendable baton and a stun gun, after they were found during searches. Police confirmed they do not believe there is a link between these items and the threat under investigation.

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The head of London's Counter Terrorism Police, Helen Flanagan, said the investigations have not revealed any evidence to support bringing terrorism-related charges, noting that the investigation is ongoing and that authorities will take additional action if any new threats emerge.

Police added that they seized more than 35 digital devices during searches that included homes and vehicles as part of the investigation.

Britain had raised the national terrorism threat level to 'severe' last April, meaning the likelihood of a terrorist attack remains high.