Detectives searching for missing airman Corrie McKeague say material found at an incinerator plant 'needs further examination' to see if it is linked to him.
The 23-year-old, from Fife in Scotland but based at RAF Honington in Suffolk, vanished after a night out with friends in Bury St Edmunds on September 24 2016.
Police now want to conduct a greater search of a plant at Great Blakenham, near Ipswich.
Detectives called off a landfill search in Milton, Cambridgeshire, after sifting through 6,500 tonnes of waste over 20 weeks - despite believing the serviceman's remains are somewhere on the sprawling site.
A Suffolk Police spokesman said: 'Police searching incinerated waste at the Great Blakenham energy-from-waste facility have recovered some material that requires further examination in order to establish whether it is in any way connected to the Corrie McKeague missing person enquiry.
'At this stage it cannot be confirmed whether or not this