A man has been arrested after firing as many as five shots inside Canberra Airport.
Passengers were evacuated and parts of the airport locked down following the incident just after 1.30pm on Sunday.
The man was arrested at the scene and taken to a Canberra police station.
No injuries were reported.
An ACT police spokesman said the gun reportedly used in the shooting had been secured and the man was acting alone.
The spokesman said the shots were not aimed at people, and the man had not gone through security screening before the shooting took place.
Canberra Airport remains closed to the public, with the top floor of the airport an active crime scene.
Flights in and out of the airport have been stopped while police secure the terminal.
Police have said there is no ongoing threat to the community or to other passengers.
Prime Minister Anthony Albanese said he had been briefed on the airport incident.
Finance Minister and ACT senator Katy Gallagher said she had been shocked by the event.
"Our local airport is such an important part of the Canberra community and it must have been terrifying for everyone," she said on Twitter.
"Thanks so much to the first responders for keeping everyone safe."
Officers are working with airport staff and airlines to reopen the airport to the public as soon as possible.
Images on social media have shown large bullet holes in window panels of the terminal.
"CCTV has been reviewed and at this time the person in custody is believed to be the only person responsible for this incident," a police spokesman said in a statement.
"The Canberra Airport terminal was evacuated as a precaution and the situation at the airport is contained."
Video online has shown police interviewing evacuated passengers for witness statements.
Passengers on planes on the tarmac at the time of the incident remain onboard.
