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.
Mike Nesbitt to retain position as Health Minister
By Jonathan McCambridge (PA)
Storm Chandra named as Met Office issues fresh weather warnings
By Clara Margotin (PA)
Jury sworn in for Noah Donohoe inquest
By Rebecca Black (Press Association)
Sharing of explicit AI images in Armagh school being investigated by police
By Claudia Savage (Press Association)
Long-awaited inquest into death of Belfast schoolboy Noah Donohoe due to start
By Rebecca Black (Press Association)
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