Hackers took over the public address systems on Tuesday at four airports, three in Canada and one in the United States, to broadcast messages praising Hamas and criticizing President Donald Trump, according to officials and news reports.

Investigators in Canada and US still searching for the group that broke into airport systems on Tuesday in Pennsylvania, British Columbia and Ontario

Confused passengers have captured the moment four airports transmitted unauthorized announcements by a group threatening a 'second September 11.'

The hacks at four North American airports raised fresh concerns over the security of noncritical but highly visible airport infrastructure. The airports said the disruption was minimal.

The four locations are smaller, feeder airports. Read more at straitstimes.com. Read more at straitstimes.com.

The Canadian Centre for Cyber Security is assisting the RCMP and airport authorities in tracing the source of the cyberattack and assessing measures to prevent further breaches.