There are currently delays at Brisbane Airport following a security matter.
The security screening process at the International Terminal was interrupted after an incident.
The matter is ongoing.
Some passengers are being re-screened, and a number of international flights will be delayed.
A passenger travelling from New Guinea tweeted that he had been waiting on the tarmac for an hour after landing due to the delays.
"All we have been told is that the airport is in lockdown," he said.
This follows a morning of dramas at Sydney Airport following a technical glitch which caused major flight delays to T1 and T2 terminals.