Mexican citizens whose relatives were victims in the Aug. 3 mass shooting at a Walmart in El Paso, Texas, have filed a lawsuit against the store chain.

Mexico’s Foreign Relations Department said Wednesday it is assisting the 10 Mexican plaintiffs in the suit, filed in El Paso.

The lawsuit, presented in El Paso County Wednesday, is intended to hold Walmart “responsible for not taking reasonable and necessary measures to protect its customers from the attack at the Cielo Vista branch in El Paso, Texas,” according to the department’s website.

It did not say what damages the lawsuit seeks, nor how many of the plaintiffs were wounded victims, or relatives of those killed.

Eight Mexicans were among the 22 people killed in the shooting; eight other Mexicans were wounded. Police have said Patrick Crusius of Dallas confessed to the shooting and that he targeted Mexicans.

The El Paso Walmart reopened its doors last week, nearly three months after the massacre.

The Oklahoma Highway Patrol told Fox affiliate KOKH FOX 25 the shooting happened just before 10 a.m. in the parking lot of a Walmart in Duncan, located roughly 75 miles south of the state capital of Oklahoma City.

The Duncan Police Department said on Facebook that the woman and one of the men were found shot to death in a car, while the other man was found dead outside the car in the parking lot.

“A handgun was found on scene,” police said. “We will update as more information comes in.”

Duncan Police Chief Danny Ford told the Associated Press that authorities are looking for witnesses to the shooting. One of the people found dead on Monday is believed to have been the shooter, though additional details have not been released.

A dispatcher told the Associated Press that “everyone is at the scene.”

Aerial images from Oklahoma City television station KWTV/KOTV showed police tape covering part of the parking lot as first responders combed through the area.

Authorities marked the location of shell casings around one red vehicle, where bullet holes could be seen in the windshield of the car.

Family members at the scene told FOX25 the shooting was the result of a domestic dispute between a husband and wife.

“Law enforcement officers have secured the scene, and we do not believe there is an additional threat to the community,” Duncan City Manager Kimberly Meek said in a statement. “Our prayers are with the victims, their families and with our law enforcement community as they investigate.”

The Duncan Public Schools said on Facebook that schools were placed on lockdown due to the shooting, but have since been given the all-clear by police.

No staff members were involved in the shooting and the store was not evacuated, Walmart spokeswoman LeMia Jenkins said in an email.

“This was an isolated incident in the parking lot and was not an active shooter situation,” Jenkins said.

The incident in Oklahoma happened less than a week after a Walmart in El Paso, Texas reopened nearly three months after a gunman killed 22 people and injured dozens more at the store in August.

Lance Cpl. Job Wallace, 20, was taken into custody by Naval Criminal Investigative Service (NCIS) and law enforcement at a Navarro County rest stop near Dallas, according to the NCIS Marine Corps West field office, The San Diego Union-Tribune reported.

NCIS did not say what Wallace was doing there or why he was taken into custody.

The Marine was last seen Monday at a friend’s house in Surprise, Ariz., and was supposed to head back to Camp Pendleton in San Diego after three days of leave.

A Border Patrol camera caught Wallace’s truck traveling eastbound on Interstate 10 southeast of El Paso, Texas, on Sept. 17 and there were reports people had seen him near Dallas on Friday.

“We offer our sincere gratitude to the local police departments in Texas and Arizona, as well as our federal partners, for their aid in bringing this to a safe resolution,” Kurt Thomas, special agent in charge of the NCIS Marine Corps West field office, said in a statement, The Union-Tribune reported.

The mass shooting — one of the worst in modern United States’ history — unfolded at a Walmart around 11 a.m. Saturday, as 21-year-old suspect Patrick Crusius, allegedly opened fire in the store, initially killing at least 20 and injuring another 26.

Police and hospital officials announced that two additional people who were wounded in the attack died Monday.

The Walmart was almost full at the time of the shooting, with hundreds of shoppers inside along with 100 employees during the busy back-to-school shopping season.

Crusius was booked on capital murder charges. Authorities said on Sunday that the crimes he’s accused of are being investigated as domestic terrorism. Officials were also looking into whether hate crime charges against Crusius are appropriate.

El Paso District Attorney Jaime Esparza said his office will seek the death penalty against the suspect.

“The loss of life is so great, we certainly have never seen this in our community. We are a very safe community,” he told reporters at a news conference on Sunday. “We pride ourselves on the fact that we’re so safe, and certainly this community is rocked, shocked and saddened by what has happened here yesterday.”

Also, a few hours later, a gunman wearing a mask, bulletproof vest, earplugs and carrying a rifle capable of holding at least 100 rounds also opened fire, outside a bar in Dayton, Ohio. At least nine people were killed and 27 others were wounded.

Some victims of the El Paso mass shooting have been identified. Among those killed was a 60-year-old man at the self-checkout line while his wife was in the bathroom, a 15-year-old who was weeks away from starting 10th grade and six Mexican citizens. A mother-of-three, who was shielding her 2-year-old son from gunfire, was fatally shot — her husband was, too.

McConnell hurt his shoulder right after he tripped and fell while on the outside patio of his Louisville home. The specifics of his injury, such as which shoulder was injured, was not revealed.

“This morning, Leader McConnell tripped at home on his outside patio and suffered a fractured shoulder,” David Popp, McConnell’s communications director, said in a statement.

The 77-year-old was treated and released and is working from his home, Popp said.

McConnell returned to Kentucky after the Senate began a five-week recess Thursday, hailing the chamber for a hard-won budget deal that staves off a possible government shutdown.

The statement said the senator had expressed his sympathies to the people of El Paso, Texas, and Dayton, Ohio, following the recent mass shootings in those communities and that he had been in touch with Republican Sens. John Cornyn of Texas and Rob Portman of Ohio to “express his deepest sympathies for the people of El Paso and Dayton and discuss the senseless tragedies of this weekend.”

Mass shootings within hours of each other in both cities killed a combined 29 people and injured dozens more.

Several Democrats including Senate Minority Leader Chuck Schumer, D-N.Y., called on McConnell to call the Senate back Capitol Hill for an emergency session to debate and vote on universal background checks legislation.

A young white man has been arrested and is believed to be the sole shooter. He has been identified by US media as 21-year-old Patrick Crusius, a resident of the Dallas area.

CCTV images said to be of the gunman and circulated on US media show a man in a dark T-shirt wearing ear protectors and brandishing an assault-style rifle. Police said the Walmart was “at capacity” with shoppers buying back-to-school supplies at the time of the attack.