Thorny bush with 5 petal white flowers and red fruit
OK, I am having some trouble identifying this plant. Even my Tree Surgeon next door neighbor doesn't know what it is.
It has long thorns (1-1.5"), fine while 5-petal flowers and red fruit (maturing from green to red).
What is it? It is growing like a shrub outside our house, but isn't necessarily a "shrub", as it hasn't been pruned in the two years we have lived here.
Here are a couple of shots of it: