A man who was engrossed in his iPad caused the evacuation of an entire terminal at Sydney Airport, a spokesperson for airline Qantas says, via Sydney Morning Herald.

The man, who had just gotten off an airplane, unknowingly breached security on Saturday when he walked into the terminal through an exit passage instead of passing through security screening. He was said to be concentrating on his iPad when the breach happened.

"The man disembarked a flight and left. It appears he wasn't paying attention, was looking at this iPad, forgot something and walked back past (the security area)," said a Qantas spokesman.

The man's actions were observed through CCTV, and as a result, airport security issued a full-scale alert, according to New York Daily News. The terminal was then evacuated.

All passengers were rescreened before they were allowed to re-enter the terminal, according to The Mirror. The incident caused a delay of about an hour.

The man, whose name was withheld, left the airport without further incident, according to CNET.

The website also raised a question about the security measures put in place by the airport's authorities following the Australian government's recent increasing of security in the country.

Australia, CNET notes, is under high alert after Prime Minister Tony Abbott announced that the country is "likely" under attack by terrorists, particularly the ISIS. The country's agencies, however, declared that they had not detected any "particular plots," according to Sydney Morning Herald.

Last year, alert level was also raised at Sydney Airport due to another innocuous situation, according to The Mirror. The domestic airport was temporarily shut down amid a bomb scare.

The Australian Federal Police bomb was called in to deal with the situation. As it turned out, the supposed explosive devices were only fake bombs which the bomb squad itself left behind after training.