British authorities have detained three people suspected of spying for Russia. Photo: AP PHOTO

British police have arrested three people suspected of assisting a foreign intelligence service, saying the investigation related to Russia, the latest allegation of spying activities on behalf of Moscow in Britain.

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The three, two men, aged 41 and 46, and a 35-year-old woman, were arrested in Essex, east of London, accused of offences under the National Security Act, which was brought in two years ago to give new powers to target threats from foreign states.

"Through our recent national s

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