A 31-year-old Valley Stream man was charged with possessing child pornography after he was caught posing as a teenage boy online to meet a 14-year-old girl at a mall, Nassau police said.

Pretending to be a 17-year-old boy, David M. Murillo, arranged to meet the girl at the Broadway Mall in Hicksville through Instagram, police said.

Police did not provide details about how the investigation began, saying only they were made aware the two had arranged to meet - a meeting that never occurred.

The investigation included a search of Murillo’s iPod; several pictures and videos of child pornography were recovered.

Murillo, who was arrested Tuesday, was charged with five felony counts of possessing a sexual performance by a child and one misdemeanor count of endangering the welfare of a child. He was arraigned at First District Court in Hempsteadon Wednesday; bail was set at $265,000, and a temporary order of protection was issued.

Murillo’s attorney, Stuart Austin of Garden City, declined to comment Thursday.

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The defendant also was arrested in 2006, along with three other Long Island men, for using Internet chat rooms to seek a sexual relationship with someone who pretended to be a 13-year-old girl, but who actually was a detective, authorities said.

Murillo was living in Syosset at the time. Voter registration records show he most recently was living at a Valley Stream address listed for his mother. Credit card records list Murillo at both the Syosset and the Valley Stream addresses.

Any parents who believe their child might have been in touch with Murillo should contact the Special Victims Squad’s Child Exploitation Section at 516-573-4022, police said. All callers will remain anonymous.

The Levittown school district posted a “Stranger Danger” alert on its website. The district did not identify the stranger it referred to, but described him as a 31-year-old man who had been contacting girls in Nassau County online and in text messages, and said he was in police custody.

“Please remind your children that if they receive a message or text from someone they don’t know, they should alert you immediately,” the district’s website message said.