MANCHESTER — A former postal carrier, accused of spanking a boy whom he let “play house” inside his mail truck, was indicted on 10 more charges alleging he sexually assaulted three children, ages 7 to 10, inside the vehicle.

Frank Saucier, 43, of 260 Pawtucket Boulevard, Tyngsboro, Mass., was arrested in April on one count of simple assault, but at that time detectives said the investigation was continuing into allegations involving several children.

On Friday, the former postal carrier was indicted by a Hillsborough County Grand Jury on six different counts of aggravated felonious sexual assault, two alleging alternate theories of the offenses; one felony count of indecent exposure; two misdemeanor counts of misdemeanor indecent exposure, and one charge of sexual assault, also a misdemeanor.

Saucier was a U.S. Postal Service mail carrier with a route on the city's West Side. Parents in the Amory Street neighborhood became suspicious of his behavior and on April 9 contacted police after learning of the children being inside the mail truck, according to police.

Detectives informed USPS, which “acted immediately” to remove Saucier from the route, according to Sgt. Craig Rousseau.

Saucier let several children “play house” inside the vehicle between September 2011 and February 2012 when he would play the “dad” and sometimes pretend to be driving the parked vehicle, according to Rousseau.

He is accused of spanking a 10-year-old boy on one of those occasions.

Rousseau said the children played inside the vehicle after they came home from school.

What's next:Saucier is expected to be arraigned in Hillsborough County Superior Court sometime in August.