Authorities combed the depths of a man-made pond in Sterling Wednesday, searching for evidence related to a dead infant girl found floating in the pond Sunday morning.

Investigators began diving Wednesday morning, according to Liz Mills, spokesperson for the Loudoun County Sheriff’s Office. The search would continue into the afternoon, she said.

“They’ll be looking for anything that might be related – blankets, sheets, anything like that,” she said.

The baby, a full-term infant girl, was discovered floating naked in the pond around 11:42 a.m. by a passerby walking a path near Steed Place and Awsley Court in the CountrySide community, authorities said.

On Monday, preliminary autopsy results failed to reveal precisely how the baby died. Because the girl had likely been in the pond for a couple days before she was found, it was not possible to determine whether there was water in her lungs, according to Loudoun sheriff’s officials. Her stomach was empty, showing that she hadn’t eaten and was likely put in the water soon after birth, they said.

The baby weighed 7 pounds and was Caucasian or Hispanic, authorities said.

Investigators continue to search for the baby’s mother, and have asked her to go to the nearest hospital or contact authorities at 703-777-1021. Anyone with information about the mother’s identity, or who saw anything suspicious in the area where the child was found, is asked to call 703-777-0475.