BURLINGTON (CBS) — Police are looking for a suspicious man in a car who allegedly approached a 6-year-old boy at a Burlington bus stop Wednesday afternoon.

Investigators are urging residents to be-on-the-lookout for an older model green Cadillac driven by a white man, possibly in his 60s. The car may have either two or four doors.

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The incident happened shortly after 3 p.m. near the intersection of Gedick Road and Gibson Street. Police say the man asked the boy for his name and where he lived. He then ran home to tell his mother what happened and she called police.

“I feel like my son was tested. He was given like an ultimate test and he passed it. But I never wanted him to get this test even though I prepared him for it,” the boy’s mom told WBZ-TV’s Louisa Moller on Thursday.

“He did exactly what I’ve always told him to do.”

She says the man was “sitting there right behind the bus, you know right in the corner, waiting for someone to get off” for about one-to-two minutes.

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The mom says a similar-looking man drove into her neighborhood last fall. He approached her in early November, saying he had leftover Halloween candy and that he was going to give it to the kids.

This week, officers spoke with two kids that said they had seen the car in question. A license plate was called in by an off-duty officer, but it turned out not to be the suspect car, police said.

Residents living in the area told WBZ-TV they’re stunned by the news.

“I was surprised,” says neighbor Pam Moreira. “We’re a pretty safe neighborhood.”

Since the incident was reported, police say they have increased patrols in the area and around bus stops during school arrival and dismissal times. Area police departments have also been notified.

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Anyone with information is asked to call Burlington Police at (781) 272-1212.