A sister-in-law of Lurgan republican Colin Duffy has been released after being arrested over suspected dissident activity.
Mandy Duffy (41) was arrested at her home on Monday and taken to Antrim Serious Crime Suite for questioning.
The mother-of-four was released on Tuesday morning.
In January Colin Duffy was found not guilty of murdering two soldiers outside Massereene Army base. Sappers Mark Quinsey and Patrick Azimkar were gunned down as they collected pizza in March 2009.
It is understood Mrs Duffy’s home was not raided before her arrest. A community worker in Lurgan, she is a well-known campaigner for dissident republican prisoners.
Two months ago her husband Paul Duffy (47) was charged with directing terrorism between 2009 and 2012.
His brother Damien Duffy (43) and his cousin Shane Duffy (41) were charged with conspiring to murder persons unknown, conspiring to cause an explosion and collecting information likely to be of use to terrorists. The three men, who deny the charges, are currently in Maghaberry prison.