The incident was believed to have occurred in the morning hours of the day.
The extent of the damage was however unclear as at the time of filing this report.
The incident was a big surprise to many in view of the retinue of security personnel, including police officers in the building.
The NPA Headoffice is where the Ports Police Commissioner has office as well.
Efforts to get the General Manager of the NPA, Eng. Jatto Adams, to speak on the incident as he could not pick his calls or reply to text message.