They say Akein Scott was found in the Little Woods neighborhood in eastern New Orleans.
Sunday’s shootings injured 20 people, including two children.
Officers say the 19-year-old has been connected to gang activity.
In March, Scott was arrested and charged with drug and gun crimes. He was released on a $15,000 bond.
The New Orleans Police Department says it has no further details on his latest arrest.
It says detectives will be available to make more information public Thursday morning.