New Orleans — A rash of violence in New Orleans and Jefferson Parish this weekend had authorities scrambling to locate motives and suspects, although New Orleans police already have made an arrest in the fatal stabbing of one man.

According to law enforcement reports, eight people were shot in New Orleans from Friday night to Monday morning, and two people were stabbed.

In Jefferson Parish, two people were shot in the same incident, and another person was stabbed in a second occurrence.

Despite the mayhem, the only fatality reported so far is Anderson Soco, 39, according to the Orleans Parish Coroner’s Office.

New Orleans police said Soco was fatally stabbed, allegedly by his girlfriend, Octavia Gary, 32, at Gary’s home in the 8500 block of Green Street in the Leonidas neighborhood Sunday morning.

Police said officers arrived at the home to find Soco with a stab wound to the chest. He later died at a hospital.

While investigating the incident, police said, they were told by witnesses and neighbors that Gary and Soco argued prior to the stabbing. Under questioning, police said, Gary provided inconsistent answers, and they booked her with second-degree murder several hours later.

Gary had a prior history of domestic violence against her boyfriend, who had an active protective order against her, according to court records.

That neighborhood has been plagued by violence in recent days as police investigated two different double shootings at the same intersection of Jeanette and Monroe streets on Saturday and Sunday. That comes after the fatal shooting March 31 of Joseph Massenburg, 18, an AmeriCorps volunteer.

According to police, at 4:17 p.m. Sunday, a 28-year-old man and a 40-year-old man were shot at the intersection when two other men exited a white vehicle and opened fire on them. Both men were wounded in the upper body and taken to a hospital in a private vehicle.

At about 9:30 p.m. the night before, police said, a 15-year-old boy and a 32-year-old man were shot while sitting on a porch at that intersection. In that incident, police said a white SUV was involved. Police also connected a white vehicle to Massenburg’s fatal shooting. Authorities have not said the incidents are connected, although Police Superintendent Ronal Serpas said investigators have received some tips in the incidents.

In addition to the Leonidas neighborhood shootings, police investigated a double shooting in the Sixth District in the 2000 block of Second Street. That incident was reported shortly before 8 p.m. and left a 26-year-old man and a 27-year-old man wounded. Police are looking for a white SUV in that incident as well after authorities said a man fired on the victims from the sun roof, striking them in the leg and buttocks.

Police investigated another shooting involving a man shot in the buttocks Monday morning in the 1800 block of Elysian Fields. In that shooting, a 20-year-old man was at around 6:30 p.m. Friday in the 1900 block of North Claiborne Avenue after a man walked up to him and opened fire while he sat in his vehicle.

Jefferson Parish’s violence was tied to a botched armed robbery in the 2300 block of Barataria Boulevard on Saturday night. Col. John Fortunato, a Jefferson Parish Sheriff’s Office spokesman, said that in that incident two men were shot, and investigators suspect one of the victims in an armed robbery attempt.

Fortunato said it appears that Robert McClure, 18, of Marrero, used a stolen shotgun to try to rob a sandwich shop where he was formerly employed. However, the owner and employee fought back against McClure, and the owner of the business opened fire on the teenager.

McClure was found behind the building with life-threatening wounds, Fortunato said. He was still wearing dark clothing and a mask, Fortunato said.

Fortunato said the 38-year-old store employee was shot in both arms, and he may have been shot by the store owner accidentally.

The Sheriff’s Office also investigated a stabbing in the 1000 block of DiMarco Drive at around 2:51 p.m. Sunday.