Travellers in Sydney are already reporting delays and a “mess” as tougher screening measures come into place in the wake of an alleged terror plot involving a plane.

Australian Prime Minister Malcolm Turnbull warned travellers to expect increased screening procedures at airports around the country following a series of terror raids in Sydney last night.

Four men were arrested after authorities foiled a plot to bring down an aircraft using an improvised device.

Turnbull confirmed the investigation was ongoing and the arrests were made in connection with a bomb plot involving an aircraft.

The government also confirmed it was an Islamic‑inspired plot and warned increased screening measures introduced at Sydney Airport would now take effect nationwide.

In a statement a Qantas spokesman said both Qantas and Jetstar are working closely with the government and airport partners to implement the increased security measures.

The airline said Australia has very strong safeguards in place at its airports and these changes are about making them even stronger.

Source: News.com.au