Haleigh Cummings Update (Photos): Cinder Blocks Discovered in Search for Missing Girl

JACKSONVILLE, Fla. (CBS) The search for Haleigh Cummings, who went missing over a year ago from her father's home in Satsuma, Fla., is still going on in earnest at the St. John's River in northeast Florida, and news reports say that two cinder blocks have been recovered, bolstering the sheriff's decision to re-classify the once missing-persons case as a homicide.

PICTURES: Haleigh Cummings Missing

Haleigh's former step-mother, Misty Croslin, was brought to the search area April 13 in handcuffs to talk with investigators on the scene, although Sheriff Jeff Hardy declined to say why Croslin was brought there.

Croslin, and Haleigh's father Ronald Cummings, were arrested in January on drug trafficking charges and remain in custody.

PICTURES: Haleigh Cummings Missing

Croslin's grandmother says that Croslin spoke to her about Haleigh's disappearance and provided details about what may have happened that night, according to local station WJXT. Flora Hollars said she spoke to Croslin on Thursday and urged her granddaughter to come clean.

She said they "tied Haleigh up with a yellow rope and tied a brick block to the rope, and dropped her into the St. John's River," Hollars told WJXT.

Hollars says the search was initiated by information given by her grandson Hank Croslin, who was arrested with Misty Croslin and Cummings in January, according to CBS affiliate WTEV.

PICTURES: Haleigh Cummings Missing

Sheriff Hardy said in a press conference that no one has been arrested for the crime, but investigators are "working on building a case," and that people are beginning to cooperate.

Misty Croslin, the last person to see Haleigh the night she vanished, has been acting more calm and, "I think she's coming to realize she's in trouble," Sheriff Hardy told reporters.

The cinder blocks, along with the other "items" that have been recovered in the search, have been sent out for testing but investigators declined to say if yellow rope was among the items.

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PICTURES: Haleigh Cummings Missing

MORE ON CRIMESIDER
April 16, 2010 - Haleigh Cummings Likely Dead, Search Area is Crime Scene, Says Sheriff
April 15, 2010 - Haleigh Cummings Update (PHOTOS): Search Area Now Called Crime Scene, Misty Croslin Arrives in Cuffs
April 14, 2010 - Haleigh Cummings Photos: Slideshow of Missing Girl, Search Continues One Year Later
April 14, 2010 - Haleigh Cummings New Hope?: Divers Search Murky River For Missing ChildJanuary 22, 2010 - Haleigh Cumming's Father, Ex-Stepmom Arrested in Drug Sting