Four airports in the US and Canada experienced unusual disruptions as hackers took control of their public address systems and flight information screens.

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

Travellers recorded the unauthorised messages, which included praise for the Palestinian group Hamas and criticism of US President Donald Trump and Israeli Prime Minister Benjamin Netanyahu.

At Harrisburg International Airport, a hacker who called himself “Cyber Islam” used the PA system to broadcast a 10-minute recorded message.

The message included chants of “Free Palestine” and used strong language against Trump and

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