A 44-year-old woman held in connection with the incident remains in custody, police say.
BBC News NI is granted rare access to one of the 2,500 disused mines across Northern Ireland.
Manchester United want Jude Bellingham and Frenkie de Jong, Chelsea sign Christopher Nkunku, Liverpool join race for Youssoufa Moukoko, plus more.
Separately nurses have threatened to escalate strike action in the new year if ministers do not enter pay talks next week.
Cruiserweight Chris Billam-Smith will push for a world title shot after stopping Armend Xhoxhaj in five rounds in Bournemouth.
Sunday's back pages
Ulster coach Dan McFarland says the decision to switch his team's Heineken Champions Cup game against La Rochelle to Dublin "was wrong".
A coalition many thought unlikely leads to a change of power between Micheál Martin and Leo Varadkar.
Kevin McMahon was a PhD physics student when he applied to be fake magician on a TV show.