BNP leader Nick Griffin will not face any action after he published the address of a gay couple who won a landmark legal ruling on Twitter, police told the BBC.
The MEP published the address of Michael Black and John Morgan on the social networking site and called for a demonstration to be held outside their home.
Following a police investigation and advice from the Crown Prosecution Service no criminal offences were identified.
More top news
Former Girls Aloud singer Kimberley Walsh is pregnant with her second child, she has revealed.
Chancellor George Osborne will seek to reassure financial markets on Monday morning following Britain's decision to leave the EU.
In his first outing since the referendum result, the lead Leave campaigner has outlined his vision for a post-Brexit Britain.