Up to 150 people are attending a rally in Westmeath in support of Sgt Maurice McCabe.
The first whistleblower John Wilson and Frank McBrearty Junior - whose father Frank Senior was the victim of police harassment in Donegal - are among those attending the event outside of Mullingar Garda Station.
Independent TD's Clare Daly, Mick Wallace and Luke 'Ming' Flanagan attending.
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The peaceful action is being taken by the group Justice-for-All.
