A motorcyclist died in the collision
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Two people have died in separate crashes in County Down and four people have been injured in a car crash in Belfast.
A 19-year-old man died when two cars collided on the Ardglass Road near Downpatrick at 1900 GMT on Sunday.
Earlier, a 44-year-old motorcyclist died in a collision with a car near Carryduff on the main Belfast to Newcastle road near Temple crossroads.
In north Belfast, four people were hurt in a crash near Woodvale Park.
Three men and a woman sustained minor injuries in the accident, which happened early on Monday morning.
It is understood at least eight people were in a car when it crashed. One man was later arrested on suspicion of driving whilst unfit, police said.
In Sunday's fatal crash near Downpatrick, it is understood the man who died was the front seat passenger in one of the cars. Two other people were injured.
Police have appealed for witnesses to the accident to come forward.
Also on Sunday, in County Meath in the Republic of Ireland, three people died in a road accident on the main Dublin to Navan road.