Suffolk Police have conducted a "thorough, methodical and detailed investigation" into the disappearance of missing RAF serviceman Corrie McKeague, a report has found.
The review, which was carried out by the East Midlands Special Operations Unit, also concluded that the force have "explored all reasonable lines of inquiry".
The news comes just days after Suffolk Police resumed their search of a landfill site at Milton near Cambridge.
The report has been passed on to the force but won't be released due to it containing operationally sensitive material.
Mr McKeague was last seen alive in Bury St Edmunds in September 2016 following a night out with friends.