But one teacher raised concerns that it looked like a bomb, prompting the school principal and several police officers to question him, search his belongings and march him from the school in handcuffs.
Police don`t believe the device is dangerous, but say it could be mistaken for a fake explosive.
Mohamed was suspended from school for three days, but he has not been charged.
The Council on American-Islamic Relations is investigating, saying the incident is typical of the negative attitudes toward Muslims in Irving.
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