Whilst we are keeping an open mind, we are very concerned for her and need to know she is safe and well as a matter of urgency.
We are carrying out extensive inquiries to trace Zoya, with specialist officers from across the force working around the clock to try to find her.
We are looking into a number of possibilities around Zoya's disappearance, including her running away from home, her being taken against her will or any worries Zoya may have had herself.
If Zoya hears this appeal herself, I want her to know that she is not in any trouble. We just need to know that she is safe and offer her help.
More top news
The banking group has also allocated £283m towards tackling its mistreatment of people in mortgage arrears.
Thursday will be a breezy day with sunshine and blustery showers developing for most of us.
She had been with friends at the station at 11pm the previous evening. Officers are now working to find out how she ended up on the tracks.