It is believed the two victims of last night's drive-by shooting in Antrim were best friends.
They and a group of friends had been celebrating a birthday when a car drove by and fired off a number of shots.
One of the teenagers - an 18-year-old Protestant - was killed while his friend, a Catholic, was shot in the ankle.
It is believed the gunmen mistakenly thought the dead teen was a Catholic.
The UDA has been blamed for the shooting.
The attack was carried out on the group of youngsters in front of St Enda's GAA club on the Hightown Road in Glengormley, Co Antrim.
The SDLP and Sinn Fein said the shooting raised fears that the UDA's ceasefire was now effectively at an end.