On Saturday afternoon, a 67-year-old woman and 19-year-old man died in a two-vehicle crash in Newry, Co Down.
The accident happened on the Dublin Road.
It is understood the man died at the scene while the woman died of her injuries in hospital.
Police at Ardmore PSNI station have appealed for witnesses to the collision, or anyone who was travelling on the road between 5.15 pm and 5.40 pm to get in contact with them on the non-emergency 101 number.
Hours earlier, two 24-year-old soldier from the 2 Rifles Regiment died after grey Fiat Punto car was in collision with a John Deery tractor on the Ballyconnelly Road in Cullybackey, Co Antrim.
The accident happened around 8.15 pm on Friday night.
A 21-year-old soldier who was also in the car was taken to hospital with head injuries which are not thought to be life threatening.
The drive of the tractor was treated at the scene by paramedics.
The soldiers who died were based at Thiepval Barracks in Lisburn, Co Antrim.
Police confirmed yesterday that 25 year old Andrius Liberis died following a two vehicle road traffic smash a few days earlier.
The incident happened at the Ardress Road, Loughgall area on Wednesday 30th July at around 2.45pm.
The mounting death toll comes just a few weeks after the PSNI launched a new road safety campaign in an effort halt the spiraling number of people being killed on the province’s roads.