A bizarre incident on a school bus in North Wales last Wednesday lands the parents of a student behind bars over the alleged bullying of their son. Police say, the bus was stopped at around 4pm on Elm Street by Christina and Christopher Gring. According to court records, the bus driver let Christina Gring in the bus because the driver thought her son may have forgotten something, but police say, Gring began questioning children to the point where many began to cry and hide. Police say Christopher Gring stood at the steps of the bus and launched a verbal assault at the students, one of his comments threatened violence. The Grings were arrested and signed statements admitting what they had done. The couple is being held in the Montgomery County Prison on 10-thousand dollars bail. They face a November 5th hearing. Their son is with a relative. The bus was carrying students from North Wales Elementary School.