A "security matter" is being investigated by police at Brisbane International Airport, causing delays to flights as boarding has been cancelled.
"Our teams are working to get everyone to their destinations as soon as possible", a spokesman told AAP.
Passengers were unable to be processed at the T-1 worldwide or T-2 domestic terminals - leaving hundreds stranded.
The glitch affected outbound flights from its global terminal and one of its two domestic terminals.
Passengers are seen waiting in line due to hardware and technical issues at the Domestic Airport in Sydney, March 9, 2018.
"Please contact your airline for flight status".
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Virgin Australia flights were also recovering from significant delays, which included two cancellations.
The issue prevented passengers from being processed for about two hours, but Sydney Airport said it had resumed screening just after 7.30am.
A spokeswoman for the airport said security screens were closed for 30 minutes as a result of the breach this morning, leading to a backlog.
All planes yet to take off were instructed to disembark so passengers could be re-screened.
"The AFP is assisting Brisbane Airport security staff following a routine passenger screening matter", a statement from the Australian Federal Police said.
Passengers said they had been waiting for nearly two hours as the departure lounge was cordoned off.