A pregnant woman was attacked in her car while she was pulled over in a bus stop last Sunday.
The 20-year-old had pulled over in Marlborough Street, near to the Redbridge Roundabout at around 10.35pm on June 1 and opened her window after feeling dizzy.
The offender grabbed her by the hair and demanded her car keys. The victim managed to get the car in gear and drove off.
The offender crossed the road and walked off in the direction of Linford Wood.
The offender is black and was wearing a beige top, possibly hooded.
The victim was scratched on the head but did not attend hospital.
If you have any information, please contact Det Con Wendy Cissell from Milton Keynes police station, via the Thames Valley Police Enquiry Centre on 101.