Police believe they've found the remains of missing Brooklyn boy Leiby Kletzky who disappeared on Monday when walking home from a Brooklyn camp.

The remains found are believed to be that Kletzy, 8, were found in a refrigerator on Wednesday inside the home of a man now being questioned by authorities.

The 31-year-old man is still being interviewed and hasn't been arrested on any formal charges, police said, according to a CBS report. CBS station WCBS in New York is also reporting that two other people are in police custody in connection with the case.

CBS also reports that Kletzky was seen on surveillance video footage wearing a backpack walking down the street. Chief police spokesman Paul Browne has said the man walking near the boy in the video is in custody.

Browne also said detectives found other body parts believed to be those of the boy wrapped in a black plastic garbage bag inside a red suitcase tossed into a trash bin in another neighborhood in Brooklyn, according to CBS.

NY1 is reporting that police are trying to piece together what may have happened by using surveillance video.

The eight year old was last seen around 5 p.m. on Monday near 44th Street and 12th Avenue in the Borough Park section of Brooklyn. He was returning from day camp and was to meet his mother nearby but never showed up.

WCBS' Pablo Guzman said Kletzky had begged his parents to let him walk home, and they gave him a note stating he wouldn't be taking the bus, according to a CBS article.

He normally took a bus down, you know, like every child, he wanted a little bit of independence, wanted to do a little bit of walking on his own, said Brooklyn Assemblyman Dov Hikind to NY1. So they had decided that they were going to - instead of walking all the way home, the mother was going to meet him just two blocks or so away from the day camp. The day camp is at 12th Avenue and 44th street, and the mother was meeting him at 13th Avenue, just one street over. Never arrived. Never showed up.

When the boy disappeared a search began involving the orthodox Jewish community, the New York Police Department and the FBI.

He respects everyone...if you would tell him, you yourself were to tell him, 'I would like you to sit here until I come back,' he would sit down until you come back, Jacob Baskal of the Borough Park Shomrim told WCBS.

READ: Brooklyn Boy Found Dead: Orthodox Jewish Killer Lured Him With Promises of Watching Television