A man being investigated as part of the ongoing probe into a Birmingham triple homicide that left a 5-year-old boy and his mother dead has been arrested on unrelated federal gun charges.

The shooting happened in the 1700 block of Indian Summer Drive, just off Winewood Road, shortly before 5:30 p.m. on Saturday, July 13.

Killed were Arkia “Kia” Berry, 28, her son, 5-year-old Landyn Brooks and Berry’s boyfriend, 28-year-old Eric Ashley Jr. The shooting happened at the entrance of Echo Highlands Park on the city’s east side.

It was only hours before four more people died in a mass shooting in a separate act of violence in Birmingham. Additionally, 10 people were injured in that shooting.

Police initially received a 911 call about a wreck. When officers arrived on the scene, they found a sedan in front of a house next to the park.

It appeared to have jumped a curb and come to a rest in front of the home. Police said the car was riddled with bullet holes.

All three victims were found dead inside the vehicle.

Witnesses told police they believe the shooter or shooters fled in another vehicle. The majority of the shell casings were in the parking area of the park.

A potential motive in the case has not been disclosed but police said the shooting was targeted.

Birmingham Mayor Randall Woodfin in response posted this on social media:

“I really want to implore those dating people in the game to not ride with them. Don’t be in the same car. Don’t allow your children to ride with them. Don’t say yes when they say come with me or take me to make this lick.”

“It’s always supposed to be “no women, no children” but y’all don’t have a code. Too many of y’all are down with killing women and children. The only thing worse than that are the people who are giving safe harbor for those who kill women and children.”

Federal court documents identify a 24-year-old Birmingham man as a potential suspect in the triple homicide.

AL.com is not identifying him because he has not been charged in the triple killing.

An ATF agent wrote in a criminal complaint that he was notified on July 18 that the Birmingham man “was identified a potential suspect” in the homicide that had happened just five days earlier.

Birmingham police said no arrests have been and declined to comment on the federal complaint.

One of the cars believed to be involved in the homicide was a leased car with Georgia license plates that had been rented by the potential suspect’s girlfriend in the week prior to the triple killing.

Birmingham’s Crime Reduction Unit set up surveillance in east Birmingham and then followed the possible suspect to a car wash where he was taken into custody and the vehicle seized.

Officers could see in plain view and “AR-variant firearm.”

They obtained a search warrant and confiscated a Kel-Tec PLR-16, which is a semi-automatic pistol, a digital scale and two baggies of what was believed to be cocaine.

The man has previously been convicted of a felony crime, so he is prohibited from legally possessing a gun. He was booked into the Jefferson County July 19 and released on July 26. A probation revocation hearing is set for next month.

ATF then charged him with prohibited person in possession of a firearm. He was taken into custody again Saturday by the U.S. Marshals and remains in federal custody.

A federal court date is also set for earlier next month.