At least 18 people were shot, including four killed, as gunfire erupted overnight in several places around Cincinnati, Ohio, authorities said Sunday.

Officers responded just after 12:30 a.m. Sunday local time (0430 GMT) to the Avondale neighborhood and found 21-year-old Antonio Blair with gunshot wounds, police said in a statement. He was taken to University Hospital and died there, they said. Three other gunshot victims were also taken to the hospital.

At about 2:15 a.m. local time (0615 GMT), officers responded to a report of gunfire in the Over-the-Rhine neighborhood where 10 people were shot, police said. One was found dead at the scene and another was announced dead at the University of Cincinnati Medical Center.

Three people were shot at about midnight Saturday in the Walnut Hills neighborhood, about a block away from the Harriet Beecher Stowe house, police said.

News outlets reported the shootings took place within 60 to 90 minutes of each other, but Assistant Police Chief Paul Neudigate told reporters that they "seem to be separate independent incidents but horrific and tragic."

Police didn't immediately provide details about the fourth fatal shooting but confirmed that it occurred on the city's West End, where television news reports indicated that one person was shot later Sunday morning and was pronounced dead at the scene.

No suspect information was immediately available in any of the cases.

Police said the department would shift officers from other assignments to beef up the number of uniformed officers in the affected communities and would call on federal prosecutors and the Bureau of Alcohol, Tobacco, Firearms and Explosives "to focus on repeat shooters and aggressively bring illegal gun charges."

Mayor John Cranley called it "senseless gun violence that ruined lives and will cause immeasurable suffering" at a time the city was facing "unprecedented circumstances and challenges" in fighting crime during the COVID-19 pandemic. He said the city has seen an uptick as people gather in private homes and public places when the bars close.

"Guns are far too prevalent at these gatherings. Please do not attend gatherings because you could end up as an innocent victim," he said in a statement.

"I am also calling on everyone to help put an end this culture of resolving personal disputes with guns as well as to reduce the far too prevalent availability of illegal guns on our streets," he said.

In July, the Enquirer reported that the city had experienced a rise in shootings and homicides from gun violence during the first half of the year as compared to the same time period in 2019.