The Loudoun County Sheriff's Office is investigating reports of an assault in a residential area of Sterling early Thursday.
A resident in the 22000 block of Circle Drive called the LCSO around 12:30 a.m., saying an unknown female had come to their door and said she was assaulted.
The victim then reportedly turned home, but LCSO deputies later located her.
She claimed she was walking home when an unknown male walked up behind her and put his hand over her mouth.
The victim did not get a good look at the suspect, and he ran away when the victim started screaming, according to authorities.
The case remains under LCSO investigation.