A man arrested in connection with the Louisiana black church fires is a law enforcement official’s son, reports say

A man arrested in connection with fires at three historically black Louisiana churches is a law enforcement official’s son, according to local reports.

Authorities said they will announce significant updates in the case — in which three churches were burned in 10 days — at a news conference Thursday at 10 a.m. (11 a.m. ET) at the St. Landry Parish Sheriff Public Safety Complex in Opelousas.

Officials with knowledge of the investigation told CNN on Wednesday night that a 21-year old man from St. Landry Parish was arrested in connection with the fires.

CNN has been provided the name of the subject but is not reporting it until it is announced by authorities.

St. Mary Baptist Church in Port Barre burned on March 26, followed by Greater Union Baptist Church in Opelousas on April 2 and two days later, Mount Pleasant Baptist Church in the same town.

The fires are believed to have been intentionally set, a local elected official said Tuesday.

Officials are also investigating a fourth, smaller fire on March 31 at the predominantly white Vivian United Pentecostal Church in Caddo Parish, more than 200 miles north of St. Landry. The blaze was intentionally set.

The FBI and federal Bureau of Alcohol, Tobacco, Firearms and Explosives are assisting in the investigations.

The NAACP has labeled the fires “domestic terrorism,” adding the “spike in church burnings in Southern states is a reflection of the emboldened racial rhetoric and tension spreading across the country.”

Louisiana Gov. John Bel Edwards will attend Thursday morning’s news conference, his office said.

Once a common occurrence

Church burnings were a common occurrence in the Jim Crow era. And fires at black churches — especially those in the South — immediately bring to mind such racist attacks.

“For decades, African-American churches have served as the epicenter of survival and a symbol of hope for many in the African-American community,” NAACP President and CEO Derrick Johnson said. “As a consequence, these houses of faith have historically been the targets of violence.”

Several black churches in the South were burned in 2015 shortly after the mass murder of nine people at the Mother Emanuel African Methodist Episcopal Church in Charleston, South Carolina, though it is unclear if those fires were racially motivated.

According to the latest data from the National Fire Protection Association, fires within religious and funeral properties have been on the decline for decades. Between 2007 and 2011, 16% were ruled intentional, according to the association.

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