Armaan Singh Sarai of Arlington, Texas, was locked up on December 11.
Arlington police Lt Christopher Cook told the Dallas Morning News that officers went Nichols Junior High School on Friday afternoon after a student told a teacher he'd heard Armaan saying he was "planning to blow up the school," apparently saying his backpack contained a bomb and he was going to place it in a school toilet.
"People have got to learn they cannot make these types of threats which cause alarm, which cause evacuations," Cook said.
"Just because you say it's a joke, it doesn't get you out of trouble."
More From This Section
However, Armaan's cousin Ginee Haer, said he was a victim of bullying that landed the young man in juvenile detention for three days.
In a Facebook post Haer said, "On Friday, December 11th, 2015, my cousin attended school, like any other normal 12 year old child. A bully in class thought it would be funny to accuse him of having a bomb, and so the principal, without any questioning, interrogation, or notification to his parents, called the police.
Aksh Singh, Armaan's brother, posted a screen capture on Facebook of a letter addressed to school principal Julie Harcrow in which he writes:
"My little brother Armaan ... Was taken from school to Kimbo Juvenile center because he and other students were joking about bomb threats. I know we live in a time when such an accusation is serious, but this is outrageous and I demand a justified reason for why a 12-year-old Indian boy was taken into police custody and sent to jail."
A spokesperson for the Arlington school district said, "We did try to contact the parents Friday afternoon, and they were aware" Armaan had been taken to a juvenile detention center, adding: "We would love to fully respond to the parents' allegations," but is unable to due to privacy legislation.