A pair of weekend phone calls are helping Las Vegas police unravel the mystery of the 8-month-old twins found last week abandoned at the University of Nevada School of Medicine.

Over the weekend, a man in Louisiana called Las Vegas police and told them Ladora Williams, 24, didn't abandon her children inside a bathroom at the medical school as police had initially believed. The man, a relative of Williams, told police he knew that because he was with the children in Louisiana.

Authorities in Louisiana checked out the claim and verified that the twins being cared for by the relative were Williams' children, said Capt. Terry Lesney of Las Vegas police's Crimes Against Youth and Family bureau.

Also over the weekend, a Las Vegas woman called police and admitted that she had abandoned twin girls in a bathroom at the medical facility on Wednesday because of a domestic dispute with the twins' father, Evans said.

"She essentially admitted to leaving her kids at the medical school," said Lt. Brian Evans of Las Vegas police's abuse and neglect unit.

Las Vegas police are attempting to verify the woman's story, he said.

The twins are in the custody of Child Protective Services.

The Las Vegas woman, who police did not identify, wasn't in police custody and hadn't been charged with any crime, Evans said. But if her story checks out, then police will send the case to the Clark County District Attorney's office, which could bring felony neglect charges against the woman, Evans said.

Police said they believe the woman left the twins at the medical school because she thought she could leave children there without penalty under Nevada's Safe Haven law, said Lisa Teele, supervisor of Las Vegas police's abuse and neglect unit.

"The Safe Haven law is truly an option, but in Nevada the age of the child can be no more than 30 days," said Teele. Under the Safe Haven law, parents won't face charges if they leave a newborn at fire and police stations or a hospital while the infant is under 30 days old.

The twins were found on Aug. 30 crying in a single-stall bathroom in an office building at the medical school, located on Maryland Parkway near Desert Inn Road. The twins were wearing soiled diapers and were hungry and thirsty, but otherwise in good health.

The medical office employee that found the twins estimated the babies were left inside the bathroom for about half an hour.

A day after the infants were found, Las Vegas police released a statement saying they were searching for Williams, who police believed was the twins' mother. Williams is still missing, police said.

An official with the school of medicine said previously that Williams was a client of an OB/GYN with an office in the building and employees recognized the twins as belonging to Williams.