Authorities released footage of the 28-year-old female shooter arriving at a Nashville Christian school and walking around the building where she would gun down six people, including three children.

Footage from security cameras around the Covenant School building shows the shooter arrive on campus and drive around the building before entering the school by shooting through glass doors. The shooter then walks through the hallways, holding her assault rifle up as she opens doors and peeks around corners. While the video does not include sound, it appears the school’s alarms went off as lights began flashing in the hallways after the shooter broke the glass to gain entry.

WARNING: The video below does not show any of the moments when the gunwoman opens fire, but some readers may still find the footage disturbing.

The shooter, a woman who identified as a man in recent months, entered the school with three guns around 10:13 a.m. Monday, killing three adults, including the head of the school, and three 9-year-old children in what authorities described as a “targeted attack.” Police arrived 14 minutes later, and the shooter opened fire on arriving officers from a second-story window. The officers, however, made their way into the school before two Metro Nashville cops returned fire and killed the shooter.

On Monday afternoon, local authorities along with the FBI searched the home of the female shooter. During the search, law enforcement said they found “a manifesto” along with maps of the school drawn in detail that included points of entry. The police chief said authorities have a theory on the shooter’s motive, but they are not ready to share it yet.

Police identified the six victims, and they include three 9-year-old children and three adults 60 years old and above.

According to the Metro Nashville Police Department, the victims are “Evelyn Dieckhaus, Hallie Scruggs, and William Kinney, all age 9, Cynthia Peak, age 61, Katherine Koonce, age 60, and Mike Hill, age 61.” Katherine Koonce was the head of the Covenant School.

The Covenant School is a private Presbyterian school in Nashville’s posh Green Hills neighborhood that educates children from preschool through sixth grade. According to the school’s website, it enrolls between 195 and 210 students.

Ivana Trump, the first wife of former President Donald Trump, was under FBI counterintelligence investigation after she eventually ended up in the U.S. after migrating out of then-communist Czechoslovakia.

Bloomberg News obtained scores of pages from an FBI file on Ivana Trump that included their findings from the international investigation that spanned from Europe to Canada.

The “secret” files said that in 1989 the FBI recommended opening an investigation into Ivana Trump based on information that bureau received from a confidential source. The FBI report noted that the allegations could have stemmed from “jealousies of her wealth and fame.”

Much is still not known about the two-year investigation other than it involved the FBI’s counterintelligence division and was deemed “highly sensitive.”

The FBI file reportedly had little information about Donald Trump in it.

The report said that the FBI found 900 pages of material that it had on Ivana Trump and, after being sued by Bloomberg News, agreed to release nearly 200 pages this week and will release the remainder next month.

The bureau can release the information now since Ivana Trump is no longer alive.

Donald Trump announced Ivana’s passing last July in a statement he posted to social media.

“I am very saddened to inform all of those that loved her, of which there are many, that Ivana Trump has passed away at her home in New York City,” the former president said in a statement. “She was a wonderful, beautiful, and amazing woman, who led a great and inspirational life. Her pride and joy were her three children, Donald Jr., Ivanka, and Eric. She was so proud of them, as we were all so proud of her. Rest In Peace, Ivana!”

Ivana Trump was mother to the three oldest Trump children, Donald Trump Jr., Ivanka Trump, and Eric Trump.

Ivana Marie Zelnícková was born under communist rule in the former Czechoslovakia. She was athletically gifted growing up as she participated in competitive skiing starting at the age of six and continued skiing through college and reportedly was an alternate for the country’s Olympic team in the 1972.

Ivana Trump later immigrated to Canada in the 1970s where she worked as a ski instructor before starting her modeling career which landed her in New York in 1976 — where she quickly met Donald Trump.

Ivana Trump married Donald Trump in 1977. The couple later got divorced in 1992.

The New York Times reported that Ivana Trump was a “critical part” in Donald Trump building his real-estate business, describing her as extremely hard working and with a keen eye for details. At one point she served as vice president for interior design at the Trump Organization.

Ivana Trump and Donald Trump were on good terms in recent years, reportedly speaking as often as once a week, as she supported him politically and encouraged his use of Twitter.

Ivana Trump was married to Alfred Winklmayr before she met Donald Trump. Ivana Trump’s marriage to Winklmayr lasted two years.

After her marriage to Trump, Ivana Trump married Riccardo Mazzucchelli in 1995. That marriage later ended in 1997.