What we know about James Alex Fields Jr., the suspect in the Charlottesville car crash

Abermarle Charlottesville Regional Jail(CHARLOTTESVILLE, Va.) -- James Alex Fields Jr., the 20-year-old Ohio man police say deliberately accelerated his car into a crowd of counterprotesters on Saturday in Charlottesville, Virginia, killing a young woman, appeared in court on Monday for the first time and was denied bail.

Heather Heyer, 32, an activist who was protesting against a white nationalist gathering that was taking place in the city that day, was killed in the crash. At least 19 others were injured.

Attorney General Jeff Sessions told ABC News on Monday that the incident "does meet the definition of domestic terrorism" under U.S. law, and confirmed that the Department of Justice is pursuing what Fields allegedly did "in every way that we can make a case."

Here's what we know about Fields, his background, and the alleged crime he perpetrated:

An alleged admirer of Hitler and concentration camps

Fields "thought Nazis were pretty cool guys" in the words of Derek Weimer, who told ABC News that he taught World History to Fields, as well as a course called America's Modern Wars, when Fields was a student at Randall K. Cooper High School in Union, Kentucky.

Weimer described Fields as being "fairly quiet" and "smart" and also claimed Fields was an open admirer of Adolf Hitler and the Nazis.

He said that he challenged Fields' point of view as a teacher, and that the two had many private discussions on the subject of Nazis.

Two of Fields' classmates told ABC News about a trip to Europe that a group of students took after graduation in 2015, when they visited the Dachau concentration camp in Germany. When they arrived at the concentration camp, Fields allegedly said, "This is where the magic happened," according to the two students.

At least 28,000 people, including countless Jews, died at the Dachau complex and its "subcamps" located elsewhere in Germany, according to the U.S. Holocaust Museum. Horrific experiments were conducted on many of the prisoners who were kept there.

From an area of the country lacking in diversity

Weimer said that Fields had little interaction with non-whites at school, at least as far as he could tell.

"We had between 1,200 and 1,300 students at that time," Weimer told ABC News. "Maybe 4 percent were black. There were only a handful of Jews. The school was just about 6 percent Latin-American."

'A car careening through a crowd'

Tommy, an organizer for the Richmond, Virginia, chapter of Democratic Socialists of America (DSA), a socialist organization that claims to have seen a major surge in membership following the election of Donald Trump, was there when Fields allegedly rammed his car into the crowd of people.

Tommy, who asked ABC News not to use his last name to protect his identity, said he and other activists were in a celebratory mood until a car careened through the crowd, sending people scrambling.

Kristin Adolfson, a graduate of the University of Virginia who works as a graphic designer at a nonprofit, told The New Yorker that she experienced a "sudden movement through the crowd, sound, bodies in the air" at the scene.

The incident was captured on video from both the front and back of the accelerating car, and the tapes appeared to show the vehicle ramming wildly into the back of other cars, sending the bodies of activists flying through the air.

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