Parts of East Midlands Airport have been sealed off twice following the discovery of a suspicious package.
Emergency services were called to the Donington site at about 0330 BST and evacuated a distribution centre.
The area was reopened just before 1000 BST but a cordon was re-imposed just before 1400 BST so the package could be re-examined "as a precaution".
Airport authorities said public areas had continued to operate throughout the incident.
A police spokesman said: "The package is being re-examined as a precaution and as such the cordons that were originally put in place have been reinstated as a precaution.
"This has meant that a freight distribution building and a number of offices have been closed together with internal airport roads - Beverley Road and Argosy Road."
Emergency services have not given details of why the package was re-examined after being declared safe.
