Police investigating the death of Caitlin White have arrested a fourth teenager.
The 15-year-old was arrested on Thursday afternoon and later released on police bail.
The arrest comes after three other males, aged 19, 17 and 15 were arrested and also released by police on bail.
Caitlin (15) died on Saturday night shortly after being taken to Craigavon Area Hospital in a suspected drug-related incident in Co Armagh.
The Craigavon Senior High School pupil had been out with a group of friends who regularly congregate in the newly developed area owned by the Woodland Trust.
Her family have been left devastated.