A 70-year-old school bus driver has been charged with abduction after police say a 14-year-old girl was abducted on four separate occasions last month.

The driver, David Nauss, had been working for Attridge Transportation since 2013, without incident.

Police say he was also a volunteer for CityKidz, driving buses and participating in home visits. The charges only relate to his time working for Attridge.

David Nauss

David Nauss was a school bus driver for Attridge Transportation and CityKidz. (Hamilton Police Service)

Nauss is now in custody, awaiting a bail hearing on four counts of abduction. Police declined to detail what happened.

The girl is "developmentally delayed", and traveled to and from school on an Attridge bus, police said.

Police believe there may be more victims and are asking anyone with information to contact them.

"He's got opportunities where he's with children," said Acting Det. Sgt. John Pauls.

Attridge suspended him from all driving as soon as someone complained to them on Oct. 24, then fired him the next day, said Glenn Attridge, president of Attridge Transportation. He declined to share details of the citizen's complaint, citing the ongoing police investigation.​

He called the student's mother and police.

CityKidz terminated his volunteering as soon as they heard of the police investigation, which was last Friday, said president Todd Bender.

"The safety of our kids is paramount to everything that we do," he said.

Between 1,600 and 2,000 children are involved in CityKidz programs, and the organization picks some up at school to transport them. But Bender said the organization has policies against an adult being alone with a child — whether driving a bus or doing home visits.

It's been a tumultuous year for Attridge, which struggled to fill driver jobs for all of its routes. 

Despite that, "it's not hard to lose this person," said Attridge.

Attridge said there's no comparison between that challenge and the seriousness of the allegation.

"This is an isolated incident," Attridge said. "An individual has made a lot of bad choices here. And I don't think that should be a reflection on school bus drivers or on Attridge as a whole."

Police ask anyone who has information that might help them investigate to get in touch with Det. Kerry Duench at 905-540-6252 or contact Crime Stoppers.