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 in 90s dies following Co Down road crash
By Jonathan McCambridge (PA)
Police to increase patrols after second incident of shots being fired in Belfast
By Jonathan McCambridge (PA)
Woman charged over theft of campaigner’s car ‘must stay out of Belfast’
By Rebecca Black (PA)
Bluetongue restrictions in Northern Ireland will be relaxed from Friday
By Gráinne Ní Aodha (PA)
Conviction led to safeguarding review at Presbyterian Church
Gráinne Ní Aodha and Rebecca Black (PA)
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