Two Dekalb County teachers have resigned after allegations emerged they used ‘zip ties’ to tie the hands of students as young as four behind their backs as a form of punishment.

According to Atlanta new station WSB-TV 2, the incident occurred at Oak View Elementary in Dekalb County on Monday of last week.

It was reported that the school sent out a letter to parents regarding the incident after a parent called the school to complain. The letter reportedly informed parents the teachers involved had been suspended pending an investigation.

The teachers then resigned from their roles on Friday.

The young students also told their parents that the teachers threatened to throw spiders on them as another form of punishment.