Bedfordshire Police have arrested two more people on suspicion of murder in connection with a body found between Turvey and Carlton earlier this month.
Kamil Leszczynski, 33, of Knox Road, Wellingborough, was found in fields off Turvey Road, on 1 July.
Last week (21 July) officers from the Bedfordshire, Cambridgeshire and Hertfordshire Major Crime Unit (MCU) arrested a man in his 40s and a man in his 30s, from Northamptonshire.
Detective Superintendent Ian Simmons, from MCU, leading the investigation, said: “While we have made two further arrests in the case, we are continuing to appeal for anyone with any information to come forward.
“We are keen to speak to anyone who knew Kamil, had knowledge of his whereabouts in the lead up to 1 July, or if you have any knowledge of the fields where his body was found.
“No matter how insignificant a piece of information seems, it could play a vital role in our investigation, so please get in touch.”
One man has been released on bail and the second was released under investigation, as police enquiries continue.
A third man was arrested earlier this month.
Police are asking anyone who may have any information, to call 101 or report it via their online reporting centre, quoting Operation Helianthus.
You can also contact Crimestoppers, anonymously, on 0800 555 111 or by visiting Crimestoppers-uk.org