A woman was punched and then sexually assaulted on St Andrews Street, Northampton on Saturday, 24 September.
Sometime between 1am and 3am the victim had left the town centre and was walking home. She passed the Salvation Army centre, onto St Andrews Street when the offender punched her and assaulted her.
The suspect is described as white, around 5ft 10ins tall, of medium build, in his early 30s and with pale skin.
He had short blonde hair and was wearing a white polo top and grey shorts.
Anyone with information can contact Northamptonshire police on 101. Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111.
And in the other incident, witnesses are being sought following a sexual assault that occurred in Northampton between 3am and 3.30am on Sunday 18 September.
A woman, walking down Bridge Street, noticed she was being followed and sat on a wall hoping that the person would walk past her.
However, the man sat next to her, touched her leg, her neck and pulled her hair. The woman then made a call on her mobile phone and walked away.
The offender is described as a 5ft 9in Asian man in his 30s, of medium build, with short black hair, clean shaven and wearing a black shirt.
Anyone with information can contact Northamptonshire police on 101. Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111