Two more people have been arrested after a man was found stabbed to death on a bridge in Greater Manchester.
Police believe the body of Paul Begley, 43, had been carried in a car before being dumped in Woodend Lane, Hyde. It was found on Saturday morning.
A 17-year-old boy and 39-year-old woman have been arrested on suspicion of assisting an offender.
Detectives have been given more time to question a man, 38, and woman, 31, on suspicion of murder.
A post-mortem examination revealed that Mr Begley, of Farnworth in Bolton, had suffered multiple knife wounds.
Officers want to hear from anyone who has information about an MG ZS, registration number PJ54 MOV, which police believe was used to transport Paul's body to the canal bridge in Hyde.
The car has since been recovered by police on Lindale, off Windermere Road, Hyde, and police want to speak to anyone who saw this car parked there between the morning of 11 December and 13 December.
Det Supt Paul Rumney said: "We're doing all we can to find who is responsible, but I'm urging the public to help us out.
"People walk their dogs, cycle and jog in the area and I'm appealing to anyone who may have been out on Saturday morning to contact us if they saw anything unusual at all."