Investigations are continuing into two fatal crashes in Down and Derry overnight.
The PSNI says a teenage boy died in an apparent hit and run in Coleraine.
A 23 year old man has been arrested in connection with the fatality and is being questioned on suspicion of dangerous driving causing death.
While a motorcyclist has lost his life in a collision in Saintfield in Down.
Anyone who witnessed either incident is urged to contact police.