A suspect is now in federal custody in Huntsville, Alabama, after a weekend fire that damaged the police headquarters in Senatobia, Mississippi. The small north Mississippi city has been on edge for months over the police killing of 1-year-old Kohen Wiley.

The ATF's New Orleans field office made the arrest public on Monday. Its agents worked with Huntsville officers and state investigators from Mississippi to track the suspect down. No name has been released. Officials also have not said whether anyone has been formally charged.

Federal prosecutors in the Northern District of Mississippi are handling the case. The ATF says the investigation is still open and more details will come out later.

A fire before dawn

Firefighters were called to the station at about 4:58 a.m. Saturday after smoke was reported inside. Crews put the flames out quickly and cleared the smoke from the building. Nobody was hurt.

Federal investigators say someone deliberately lit the blaze using fire and a substance meant to help it spread. Officials have not said how badly the building was damaged. The department says officers are still answering calls.

Interim Police Chief LaMorris Hampton thanked residents whose tips helped identify a suspect so fast. He also thanked the state fire marshal along with sheriff's deputies in Tate County and DeSoto County. In a statement to residents, Hampton said the department would not stand for violence aimed at anyone in the city.

Authorities have not offered a motive. They have also not drawn any link between the fire and Kohen's death.

A birthday without Kohen

The fire broke out one day before Kohen would have turned 2. Hours later, neighbors gathered at the city's community center to hand out diapers, wipes and food to local families in his memory.

Kohen was on his mother's lap in a car outside a Senatobia Walmart in June when an officer fired into the vehicle. Police had been told that women in the car were suspected of shoplifting diapers and baby clothes. The boy was killed.

Mississippi Attorney General Lynn Fitch ruled last month that Sgt. Hunter Foster was justified in using deadly force. Foster later resigned. The city's police chief was also fired after news reports revealed racial slurs in his text messages.

Parents take their grief to Jackson

On Monday, Kohen's parents joined activists in the lobby of the downtown Jackson building that houses Fitch's office. They chanted that their baby's life mattered and asked to meet with the attorney general face to face.

Fitch was not there. Her chief of staff met the group instead and told them the attorney general was traveling in north Mississippi. She called the shooting tragic but said the office had followed the law and the facts.

Marquell Bridges, an activist who has worked alongside the family, said voters hold the real power over elected officials. "We vote. We put them in office," he said.

On Election Day eve, Kohen's father wore a shirt with his son's picture urging people to cast a ballot in the boy's honor. He said he wants Foster prosecuted. Fitch is a Republican who plans to run for governor next year.

The ATF is asking anyone who knows something about the fire to call 1-888-283-8477.