TRACY, Calif. (AP) - The focus of the investigation to find whoever killed an 8-year-old Northern California girl and put her body in a suitcase has narrowed, but no arrests have been made, police said Thursday.
Sgt. Tony Sheneman told reporters that authorities are headed in the right direction in the case of Sandra Cantu, but wouldn't give details.
"The focus is not as broad as when the investigation began," Sheneman said.
The sergeant said the department has received many tips ranging from "psychic information to information that doesn't make a great deal of sense," conducted dozens of interviews and served more than 15 search warrants since Sandra disappeared March 27. Sheneman said everyone the police have contacted have been cooperative.
Sandra's remains were found in the suitcase Monday by farmworkers draining an irrigation pond. An autopsy has been completed but results have not been released.
Sandra's aunt said Thursday the family did not know who could've killed the little girl.
"We don't have any idea who could have done something this horrible to her," Chavez told NBC's Matt Lauer on the "Today" show.
Sandra's mother, Maria Chavez, was overcome by emotion and unable to speak after telling Lauer how much she loved her daughter.
Community residents and law enforcement had spanned across the area looking for Sandra for 10 days, then after the gruesome discovery of Sandra's body, erected a makeshift memorial of balloons, cards, pictures and flowers outside Orchard Estates Mobile Home Park, where Sandra lived.
With rain forecast, the memorial was taken down late Wednesday night and early Thursday at the request of the family, and the stuffed animals and other items were donated to charity. On Wednesday, Angie Chavez and other relatives visited the site.
"It gives us comfort, and it's a testament to the heart that Sandra had and how many people she touched," she said then.
On ABC's "Good Morning America" Thursday, Sheneman again defended the department's decision not to issue an Amber Alert after Sandra went missing.
Police lacked enough details on her disappearance to meet the requirements for an Amber Alert, he said, though an electronic alert did go out to West Coast law enforcement agencies.
Associated Press writer Terence Chea in San Francisco contributed to this report.
Copyright 2015 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.