1. An upsurge of/in violence in the district has been linked to increased unemployment.(Cambridge Advanced Dictionary)
2. The recent upsurge in violence was also due for discussion at the Dublin meeting, which involved Fine Gael leader John Bruton and Progressive Democrat leader Des O'Malley. (BNCI)
3. The upsurge in violence in Liberia has forced thousands of people to move into camps, especially in the suburbs of Monrovia, or to cross the borders into Sierra Leone or Guinea.(WebCorp)