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.
Police investigating Arson Attack in North Belfast
By Q Radio News
McIlroy honours omission came despite Stormont nomination
Written by PA reporters
Man may require facial reconstructive surgery following assault in Omagh
By Rebecca Black (PA)
Police seize ‘significant quantity’ of drugs following chase
By Rebecca Black (Press Association)
Woman dies in hospital after road crash in Co Fermanagh
By Rebecca Black (Press Association)
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