According to Lusa News Agency large gatherings of passengers formed both inside and outside the building as an unclaimed bag caused a confusion that led to check in desks closing.

The incident is understood to have happened at around 8.30 but 45 minutes later things were gradually returning to normal.

Between those times the entrance to the terminal is said to have been blocked by police.

Lusa reports passengers claim no information was given as to why the action was being taken and no official statement has been made by airport managers ANA as yet.