A PSNI officer’s laptop and notebook fell from a moving vehicle on the foreshore stretch of the M2 motorway, on Thursday (17 August) around 4.15pm.
The laptop was immediately deactivated and has been recovered.
Sections of the notebook remain outstanding.
Police say an investigation is underway to establish the contents of the notebook.
“We will be liaising with the Office of the Information Commissioner and have advised the Northern Ireland Policing Board and the Department of Justice.
“Anyone with information or who recovers any material is asked to contact police on 101,” said a spokesperson.