Bags of bones which were found dumped in a river in Britain are "most likely" to be human remains, Suffolk Police have said.
Officers were called following the discovery in the River Stour between Meadow Gates and Croft Bridge in Sudbury yesterday afternoon.
Police said a cordon has been put in place while the investigation continues.
A Suffolk Police spokesman confirmed a second cordon was in place but was unable to give an exact location.
Assistant Chief Constable Rob Jones told BBC Radio Suffolk it was "too early to say" if the remains, found near a submerged shopping trolley, had been dumped in recent days.
He said: "It is very concerning when something like this is found. And in the early stages we have to keep a very open mind about what we have, and about the circumstances.
"As we get the scientific information back, and as witnesses hopefully come forward, we build up a picture of what's happened, and we're able to direct our inquiries based on that information."
Mr Jones said a wildlife ranger made the discovery and contacted police.
He added: "These kinds of incidents are extremely worrying for anyone with families of missing people.
"We have a Home Office post-mortem which will look into that and help us ascertain what we have.
"At this stage, we're certainly treating them as most likely to be human remains."
