The tweet made it unclear whether police had made contact with the woman.
Police said that she is an Asian female, 4-feet 11-inches tall and 111 pounds. They were also trying to find two vehicles, a Hyundai Tucson and Chrysler Pacifica. The license plate numbers are Nevada 114B40 and Nevada 79D401 respectively.
According to Las Vegas police, at least 58 people are dead and more than 515 people are injured.
Las Vegas police say that the shooter, who is dead, was a Las Vegas local. NBC news reported that the suspect has been identified as 64-year-old Stephen Paddock, a white male from the Vegas area. Lombardo said Paddock died of a self-inflicted gunshot wound.
Police are also asking anyone with video from the incident to get in contact with them. At this time, they do not know why the man decided to shoot into the crowd.
Las Vegas police say that they do not believe there are any other shooters on the loose. They will be updating the press briefly.