More than 200 volunteers searched unsuccessfully for a missing 3-year-old girl, and police indicated that she may have been killed.

Bloodhounds aiding in the search picked up a scent Sunday, but it did not lead to Niveah Gallegos.

Niveah's 20-year-old mother, Miriam Gallegos, reported her missing and the possible victim of a kidnapping Friday. Police later arrested the mother on suspicion of false reporting, child abuse resulting in death, and being an accessory to a crime.

The woman's boyfriend, Angel Ray Montoya, 22, was being held on suspicion of first-degree murder.

Police have not released details on why they believe the girl may be dead. They have said the girl's body may have been wrapped in a plastic bag and dumped in a trash bin.

The city requested a delay in trash pickup Monday from Dumpster-size bins. "We're asking all businesses to look in their trash Monday for anything that might be different," police spokesman Sonny Jackson said.