Mayor Marty Small, police and other authorities spoke in the wake of four homicides one week into the new year.
On New Year's Day, two men were killed in separate incidents.
The following weekend, two others were killed, including a 14-year-old boy.
"It is unacceptable what happened," Small said. "At the end of the day, we're going to move forward to prevent anything else from happening."
Police say they are intensifying their presence in certain neighborhoods, to keep residents safe.
They have also increased their minimum staffing levels and will be installing more security cameras across Atlantic City.