Australian Border Force (ABF) is refusing to explain what caused a failure at passport control gates which caused significant delays at airports around the country on Monday morning.

Key points: This morning's delays followed a weekend of disruption caused by wild weather

This morning's delays followed a weekend of disruption caused by wild weather Australian Border Force (ABF) confirmed the outages were nationwide

Australian Border Force (ABF) confirmed the outages were nationwide SmartGate passport control machines had also gone down in April of this year

Passengers at Sydney Airport's international terminal were met with long queues as they attempted to use passport security e-gates this morning, with the line spilling out into the departure lounge area.

An (ABF) spokesperson said the outage affected services nationwide.

At Melbourne International Airport, a spokesman confirmed there had been delays in processing customers and longer queues at the airport, but he said no flights had been delayed.

Loading

On Twitter, one woman described the queues as "absolutely crazy" and other passengers posted videos of long lines forming at immigration control at Sydney Airport.

ABF provided updates in short statements and said "staff are working hard to minimise earlier delays caused by an earlier outage".

After a couple of frustrating hours for travellers, the ABF said all issues "have now been rectified".

"We apologise for an inconvenience this has caused travellers," an ABF spokesperson said.

However, it did not provide an explanation for what caused the incident and told the ABC it had no plans to respond to requests for further information.

This morning's delays at the airport follow a weekend of disruption due to damaging winds that caused the cancellation of over 50 flights and left only one runway operational.

Jetstar reported this morning that several domestic flights had been cancelled due to strong winds — some Jetstar customers had already been stranded for days.

"We appreciate delays are frustrating, however, safety is our highest priority," a statement from the airline said.

This morning's issue comes after the SmartGate passport control machines went down across the country in April, causing mass delays.