They were being questioned at Musgrave Police Station in Belfast.
A man and woman arrested in connection with the murder of Michael McGibbon have been released unconditionally.
The father of four died from his injuries after he was shot in the leg in Butler Place in Belfast in April.
Springhill families accuse Government of ‘silence’ over inquest findings
Police appeal following Omagh road death
Man treated in hospital after being shot in leg
Former UUP leader insists he is focused on reselection for Assembly poll
NI First Minister excited by ‘seismic political shift’ across UK
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