A coordinated cyberattack on Tuesday hit three Canadian airports and one in the United States, disrupting digital displays and alarming travellers with politically charged messages.

The affected airports were Kelowna International Airport and Victoria International Airport in British Columbia, Windsor International Airport in Ontario, and Harrisburg International Airport in Pennsylvania.

Screens at these smaller, regional airports displayed messages praising Hamas and criticising former US President Donald Trump and Israeli Prime Minister Benjamin Netanyahu.

According to a spokesperson from Victoria International Airport, the hackers breached third-party cloud-based software used to manage display systems.

“They displayed messages in a foreign language. We quickly switched to an internal system to regain control,” the spokesperson told Reuters.

Windsor International Airport confirmed that its systems were affected via a cloud software provider but “returned to normal shortly thereafter.”

At Harrisburg Airport, an audio announcement was also hijacked, with a woman’s voice saying “Free Palestine” and using expletives directed at Trump and Netanyahu. The voice also claimed responsibility in the name of “Turkish hacker Cyber Islam.”

Visuals and audio clips purportedly showing the incident have gone viral online, though their authenticity could not be independently verified.

US Transportation Secretary Sean Duffy condemned the cyberattack, calling it “absolutely unacceptable and understandably frightening for travelers.”

Authorities on both sides of the border — including the Royal Canadian Mounted Police (RCMP), the Canadian Centre for Cyber Security, and the US Federal Aviation Administration (FAA) — have launched investigations into the breach.

The attack follows a wave of recent airport cyber incidents, including last month’s disruption at major European hubs such as London’s Heathrow Airport and Brussels Airport.