The incidents occurred in south and southwest Charlotte and in the city’s northeast. As of noon Monday, police had announced an arrest in one case and no arrests in the other three. Investigators had not publicly established what led to the shootings.

The first shooting was reported around 3 a.m. Saturday on High Meadow Lane near Interstate 77 in south Charlotte. Paramedics pronounced Zachary Howie, 35, dead from a gunshot wound. No arrest had been made.

At about 5:30 p.m. Saturday, officers responded to a shooting on Simril Court near South Tryon Street in southwest Charlotte. Abdullah Hamid, 52, was taken to a hospital, where paramedics pronounced him dead. No arrest had been announced.

A third shooting occurred around 11 p.m. Saturday on Altliff Court near McLean Road in northeast Charlotte. Firefighters pronounced Thomas McDonald, 47, dead at the scene from multiple gunshot wounds. Andrea Cole, 25, was arrested and charged with first-degree murder. The circumstances preceding the shooting were not immediately clear.

The fourth shooting was reported around 4 a.m. Sunday on Ridge Creek Drive near Carowinds Boulevard in southwest Charlotte. Four people were shot. Two — an unidentified 16-year-old and Ariel Isaac Rodriquez-Pineda, 19 — died at the scene, police said. Two other teenagers were injured, one with life-threatening injuries and the other with injuries that were not life-threatening. No arrest had been announced in that case by Monday noon.

The deaths occurred across several Charlotte neighborhoods within roughly 25 hours. Police investigations into the four incidents were ongoing as of Monday.