The girls say school security ordered them to remove the shirts or cover them up because they were "gang-related." The students say they were also threatened with suspension.
The principal then called a meeting with the girls, their parents and the security guards. One of the parents tells TMZ the principal told them the t-shirts were "inappropriate for school because they were gang-related" and the girls would be suspended if they wore them again.
One parent tells us, "It's ridiculous. They're good kids who love Justin Bieber."
A rep for the school tells TMZ, "Students at Roosevelt High School were not banned from wearing shirts displaying the image of Justin Bieber, nor were they accused of being in a gang."