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.
Man charged with murder of Amy Doherty
Q Radio News Team
New medical reports on Eleanor Donaldson submitted, court hears
By Jonathan McCambridge (Press Association)
MLAs set to be recalled over cancellation of special school summer schemes
By Jonathan McCambridge (Press Association)
Murder investigation launched after death of man in Portadown
By David Young (Press Association)
Minister looking at ‘contingency plans’ for special school summer scheme
By Cillian Sherlock (Press Association)
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