TRENTON - Officials are concerned after what they call a 'wave of violence' is sweeping across New Jersey.

In Trenton, four people were shot, one fatally, just before 3:30 a.m. Saturday. The shooting, which involved two men and two women, happened on North Willow Street. Investigators say two men came upon the group, and opened fire. No arrests have been made and the investigation is ongoing.

New Brunswick police say an argument lead to one man being shot in the stomach twice Friday night. The victim, a 20-year-old male from New Brunswick, is expected to be OK.

In Asbury Park, family and friends mourned the loss of Derek Williams, who was shot and killed on a street corner earlier this week. Williams' death marks the third killing in Asbury Park in three weeks.

In Paterson, city council members are expected to vote on declaring a state of emergency during this Tuesday's meeting.

Paterson city leaders want official 'state of emergency' declared