Prince, there is a piece of the story you missed. I found a "nutshell" version on colorofchange.org:
Last fall in Jena, the day after two Black high school students sat
beneath the "white tree" on their campus, nooses were hung from the
tree. When the superintendent dismissed the nooses as a "prank," more
Black students sat under the tree in protest. The District Attorney
then came to the school accompanied by the town's police and demanded
that the students end their protest, telling them, "I can be your best
friend or your worst enemy... I can take away your lives with a stroke
of my pen."
A series of white-on-black incidents of violence followed, and the DA
did nothing. But when a white student was beaten up in a schoolyard
fight, the DA responded by charging six black students with attempted
murder and conspiracy to commit murder.
The noose-hanging incident and the DA's visit to the school set the
stage for everything that followed. Racial tension escalated over the
next couple of months, and on November 30, the main academic building of
Jena High School was burned down in an unsolved fire. Later the same
weekend, a black student was beaten up by white students at a party.
The next day, black students at a convenience store were threatened by a
young white man with a shotgun. They wrestled the gun from him and ran
away. While no charges were filed against the white man, the students
were later arrested for the theft of the gun.
That Monday at school, a white student, who had been a vocal supporter
of the students who hung the nooses, taunted the black student who was
beaten up at the off-campus party and allegedly called several black
students "nigger." After lunch, he was knocked down, punched and
kicked by black students. He was taken to the hospital, but was
released and was well enough to go to a social event that evening.
Six Black Jena High students, Robert Bailey (17), Theo Shaw (17),
Carwin Jones (18), Bryant Purvis (17), Mychal Bell (16) and an
unidentified minor, were expelled from school, arrested and charged
with second-degree attempted murder. The first trial ended last
month, and Mychal Bell, who has been in prison since December, was
convicted of aggravated battery and conspiracy to commit aggravated
battery (both felonies) by an all-white jury in a trial where his
public defender called no witnesses. During his trial, Mychal's
parents were ordered not to speak to the media and the court
prohibited protests from taking place near the courtroom or where the
judge could see them.