COSTA MESA (CBSLA) – A 30-year-old Costa Mesa man is accused of molesting two boys while working as a nanny.

Matthew Antonio Zakrzewski was arrested by Laguna Beach police May 17 at a local airport while getting off an international flight, the Orange County district attorney’s office reported Wednesday.

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Matthew Zakrzewski. (Orange County District Attorney’s Office)

In early May, a Laguna Beach couple reported to police that Zakrzewski had inappropriately touched their 8-year-old son while babysitting, the DA’s office said. The couple said they had hired him through his website.

Laguna Beach police detectives began an investigation and identified an alleged second victim, a 7-year-old Los Angeles boy, the DA’s office says.

On his website, Zakrzewski says he has at least six years of experience as a “professional manny.”

Zakrzewski has pleaded not guilty to three counts of lewd and lascivious acts with a minor under the age of 14, one count of oral copulation of a child under the age of 10 and one count of possession of child pornography.

Since his arrest, authorities say at least four more possible victims have come forward.

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CBS2 spoke to some of Zakrzewski’s neighbors who said they were stunned about the allegations.

“You just don’t think that something so sickening is so close to your front door,” neighbor Bonnie Prosser said.

“I’m just shocked. I can’t believe it.”

Another woman said she cannot believe the friendly child she’s seen grow up was facing such allegations.

“I’m very surprised and shocked,” said the woman, who didn’t want her face shown. “I did think it was odd when I knew he was doing a babysitting business, ’cause he’s a really smart kid.”

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Zakrzewski is being held in the O.C. Jail on $1 million bail. Anyone who believes they have information about any more alleged victims should contact detectives at 949-715-1300.