UPDATED: Bus Driver Arrested on Additional Charge

Editor's note: This story was updated at 2 p.m. Friday to include information from the criminal complaint.

Randy R. Mayer — the bus driver charged with inappropriately touching students on his route — is now back in custody after charges were filed for an additional student.

On Tuesday, police interviewed a 6-year-old student who . On Thursday, District Attorney Adam Gerol filed an additional felony charge of first-degree sexual assault of a child under the age of 13, according to a press release from the .

Mayer, 225 S. Madison Ave., now is charged with four felony counts involving three children, and faces up to 240 years in prison.

According to the criminal complaint, the mother of the 6-year-old recognized Mayer as her son's summer school bus driver. After hearing about the allegations, she asked her son if his bus driver had ever done anything to him.

The 6-year-old boy told his mother that Mayer had touched his privates; during interviews with law enforcement officials, the boy described a scenario

Mayer called the boy to sit in the "bad seat," an area next to the driver's seat of the bus and also referred to by Mayer as the "dog house." In one such incident, Mayer allegedly placed his hand on the boy's privates, palm down and in a right-to-left motion across the boy's shorts. The boy asked Mayer to "please stop," Mayer did, and the boy returned to his seat on the bus.

After that, the boy asked his mother to allow him not to ride the bus anymore, the complaint said.

The first three charges involved two boys, 9 and 10 years old, which took place between Oct. 1-13, 2011. The Port Washington Police Department interviewed 37 students about the allegations, said Police Chief Richard Thomas. Details from the criminal complaint .

Mayer last week, but now is back in custody pending the judge's decision about the possibility of bail after a hearing on Friday. He is expected to appear in court for a status conference at 8:30 a.m. Jan. 3.