A video of the lynching went viral on social media
Police recovered the body from the Baniyagaon Union around 10:30am on Sunday, said Bahubal Police OC Md Masuk Ali.
The victim was identified as Habib Mia, a student of Biharipur Government Primary School.
Law enforcers have taken the body to Habiganj Sadar Hospital for an autopsy, the OC said.
Police have yet to determine the cause of death.
Habib left home on Saturday and remained missing until the body was found, the OC said, quoting the family.