In a statement on Thursday in Abuja, ONSA said the correspondence was a routine threat assessment to ensure preparedness of agencies and not meant for public dissemination.
It explained that in the period covered by the correspondence, threat analysis identified the need to advise airports’ managements nationwide to upgrade existing security measures around the nation’s airports.
“Regrettably, the unauthorised release of this advisory is likely to raise fear among airport users home and abroad.
“Accordingly, this statement is issued to reassure the public and all aviation stakeholders of the safety of our airports.
“The security and intelligence services will continue to monitor security threats and provide the assessment and timely advise required by airports’ managements to continuously upgrade security measures in the airports,” it said. (NAN)