Armaan Singh, 12, was arrested on December 11 after police said he admitted to making the threat while they were questioning him without his parents present. He spent three days in juvenile detention before being released and placed under house arrest with ankle monitor. He also was suspended from school.
His mother, Gurdeep Kaur, said a classmate asked whether a battery in Armaan's backpack was a bomb, and that he said it wasn't, but the classmate told the teacher he said it was.
Kaur said the family didn't learn of Armaan's arrest until hours after it happened. She told The Associated Press that she panicked when he didn't come home from school, and after searching the apartment complex, they went to the school to look for him. She said they called the principal, who told them Armaan had been taken into custody.
"She told them that he was with the police but she didn't know which facility," said Arlington schools spokeswoman Leslie Johnston.
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Kaur said the family finally learned Armaan was in the detention center four hours after his arrest when they called police.
Police have rejected allegations that the boy's Sikh religion played a part in his arrest.
Sikhism, a monotheistic faith, was founded more than 500 years ago in Southeast Asia and has roughly 27 million followers worldwide, most of them in India. Even though Sikhs aren't Muslim, reports of Sikhs being harassed have increased with the recent rise in anti-Islamic sentiment.
Even though all four of her children were born in the US, Kaur said she wonders if Armaan's background factored into his arrest.