A 28-year-old man was attacked in Bournemouth whilst out cycling and detectives are looking for witnesses.
The incident happened at around 3.45am on Monday, July 1 along a pathway accessible from Throop Road and adjacent to the A338.
It is alleged the offenders are two men who were on a white and silver motorcycle.
The rider of the motorbike is described as white, skinny build, wearing coloured shorts and a puffa jacket with a white helmet.
A 50-year-old woman was arrested on suspicion of conspiring to cause grevious bodily harm with intent.
Detective Constable Elizabeth Horrex, of Bournemouth and Poole CID, said: "The victim suffered some nasty injuries, and we are investigating the circumstances of how he came to receive them."
More top news
Saturday morning's weather for the east of the region
Saturday morning's weather for the west of the region
12 years in prison for smuggling 8 kilos of cocaine and 7 kilos of heroin