A woman was knocked over and sexually assaulted while walking home in the Tuffley area of Gloucester.
A Gloucestershire Police spokesman said the woman was on Southern Avenue, when a man approached her, knocked her over and held her on the ground.
She kicked at him and he ran off, the spokesman said. The attacker is described as white, in his 20s and was wearing a grey hooded top.
The incident happened between 1155 BST on Friday and 1220 BST on Saturday.
Anyone who saw anything suspicious is asked to contact the force.