THE birth mother of suspected Florida State University gunman hurled insults in an angry social media tirade – before she learned her son was behind the attack.

Anne-Mari Eriksen criticized Phoenix Ikner’s dad, Christopher, and slammed his parenting. 

She and Christopher were locked in a custody dispute that spanned more than 15 years, according to court documents seen by CBS News.

The dispute started in 2007 and continued until 2023. 

While the custody dispute was ongoing, Eriksen accused Christopher and his wife, Jessica, of slander and she filed a lawsuit in 2015. The case was dismissed just one year later.

Eriksen berated Christopher and Jessica online just moments before Ikner was unmasked as the suspect behind Thursday’s attack.

She accused Christopher of being unstable and claimed they were not replying to her messages when she inquired about Ikner, according to a now-deleted post seen by The Mail.

Eriksen claimed the family is “nuts” before continuing to hurl insults about Christopher.

“He should write a book on how to parent badly, but he can’t communicate,” she claimed.

Eriksen later deleted the social media post.

Ikner was previously known as Christian Eriksen before changing his name in 2020.

Anne-Mari was found guilty over allegations that she illegally removed a child from Florida.

Court documents, seen by ABC, claimed she took her son to Norway in March 2015

Anne-Mari and Ikner have dual citizenship, according to the court filing.

Anne-Mari was arrested at Fort Lauderdale-Hollywood airport in July of that year.

Her Facebook account is littered with pictures of Ikner from when he was a small child.

In 2022, she shared a picture following his graduation from high school.

In the image, he’s crouching while leaning against a tree. 

And, she shared a montage of snaps to commemorate Mother’s Day in 2023.

“Love being my son Christian Gunnar (Phoenix) mother,” a post said.

Ikner allegedly used one of the weapons belonging to his stepmom, Jessica.

Jessica, who has been married to Christopher since 2010, is a Leon County sheriff’s deputy.

She had been with the force for more than 18 years. 

Cops received reports of an active shooting at FSU’s campus in Tallahassee at around noon on Thursday.

There were two fatalities, but the victims were not students.

Six people were injured, but those wounded are expected to survive.

Ikner was taken to the hospital but he is expected to survive as well.

He was neutralized more than three hours after cops received their initial report.

McKenzie Heeter, a junior at the university, claimed Ikner started firing shots after arriving on campus in an orange Hummer.

She told NBC News he then grabbed a pistol from the car.

“That’s when I just started running,” she added.

Heeter claimed around 15 rounds were fired within 30 seconds. 

Students were urged to shelter in place as chaos erupted on campus.

Some created barriers using trash cans as they hunkered down.

Sam Swartz told CNN he and his fellow students sought shelter in the student union’s basement.

CHAOS ERUPTS

The shooting took place just two weeks before the end of the semester.

In the aftermath of the shooting, details about Ikner’s personality and political views emerged.

Classmates accused of him of peddling white supremacist views, while others said he boasted about having access to guns.

Ikner also touted false theories about former president Joe Biden, per the Tallahassee Democrat.

And, he was reportedly kicked out of a political club. 

Cops have not revealed a motive behind the shooting.

Vigils have been held at the campus where students were seen laying memorials and consoling each other.

The U.S. Sun has approached Jessica Ikner for comment.