A man has been arrested on suspicion of drugs offences after a 19-year-old woman died.
The Police Service of Northern Ireland said the woman died suddenly in the Meelmore Drive area of Omagh, Co Tyrone, on Saturday afternoon.
The man who was arrested is 24.
Police said he was detained on suspicion of possession of class A and B controlled drugs and supplying and being concerned in the supply of class A and C drugs.
Det Constable Una McKenna appealed for anyone with information to come forward.
Meanwhile, postmortem examinations have been ordered following the deaths of two young men in the Drumtara area of Ballymena on Sunday.
Jim Allister, MLA for North Antrim with Traditional Unionist Voice, said there were investigations into whether the deaths were drug-related. – (PA)