Another sectarian assault in Derry

In what is being described as a life threatening sectarian attack, a 29-year old catholic has been left critically injured after being assaulted by a gang in the Waterside area of the city. The assault precipitated a night of violence in the area and comes after numerous sectarian attacks across the city in recent weeks, reported and discussed on this site on a number of occasions.
Not being too familair with goings-on in the city (beyond what is reported in the media), I would like to hear from Derry people some possible reasons for the alarming rise in sectarian incidents in the city this year, just as similar incidents appear on the wane in Belfast and in other parts of the north.