An East Northport man accused of sharing images and videos of children — some 2 to 5 years old — engaging in pornographic acts will remain behind bars while he defends the charges lodged against him, a federal judge in Central Islip ordered Tuesday.

Brian J. Newton, 37, and his attorney failed to persuade U.S. Magistrate A. Kathleen Tomlinson in District Court to release him on bail, even though he agreed to wear an electronic bracelet that would allow authorities to monitor his movements.

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Tomlinson said Newton was a convicted sex offender who admitted to federal agents that a year after he was released from jail he began trading child pornography. And, the judge said, Newton also told the agents that he had engaged in “sexual chats” with about two dozen people who said they were minors.

“The defendant needs help,” Tomlinson said, adding that Newton isn’t going to get it at home.

The case against Newton began in December when federal authorities got a tip that a still image of three young girls — showing their private parts — was uploaded to PhotoDNA Cloud Service from an IP address that investigators said identifies an electronic device at Newton’s home, according to the complaint filed on June 9.

Additional tips revealed that on Jan. 4, and Jan. 11, Sendvid.com and Skype, reported that videos and images of child pornography were uploaded from an electronic device with the same IP address.

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On June 8, authorities searched Newton’s home and seized a smartphone that federal prosecutor Lara Treinis Gaz told Tomlinson contained about 70,000 images, the majority of them child pornography.