BALTIMORE (AP) — One person has died while three others were wounded in several shootings in Maryland’s largest city during a weekend set aside annually to attempt to discourage violence.

One of those wounded was a 15-year-old boy. Police officers found a dead man Sunday morning in a northwest Baltimore neighborhood. Officers say nearby residents heard several gunshots Saturday night.

The Baltimore Sun reported the death marked the first killing during a “Ceasefire” weekend in Baltimore.  Activists and police ask residents to avoid violence during four specified weekends annually.

Police also reported that two other men were walk-in shooting victims who came to the hospital for treatment.