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A "security matter" is being investigated by police at Brisbane International Airport, causing delays to flights as boarding has been cancelled.

A spokesperson for Sydney Airport told ARN that the technical problems arose from "an underlying technology issue that we were addressing".

An IT failure has caused chaos at Sydney Airport this morning with both the worldwide and domestic terminals affected.

The other domestic terminal, T3, is operated by Qantas and did not experience the same issue.

It comes as Sydney Airport was thrown into turmoil this morning when a technical issue caused major delays to flights from terminals 1 and 2, with the airport even going as far as telling passengers to avoid the airport altogether.

"We are experiencing outbound delays while we fix this technical issue which we're working to rectify as quickly as we can", she said.

The issue prevented passengers from being processed for about two hours, but Sydney Airport said it had resumed screening just after 7.30am.

Virgin Australia said it was holding some flights to minimise disruptions and was working to re-accommodate those affected.

Virgin Australia flights were also recovering from significant delays, which included two cancellations.

We are proactively communicating with those impacted and we encourage passengers to check the flight status page on our website'.

A spokeswoman for Brisbane Airport told the Courier Mail security screens were closed for 30 minutes after the breach.

All planes yet to take off were instructed to disembark so passengers could be re-screened.