Transcript for Arrests made in suspected terror plot in Australia

some breaking news coming in from Australia at this hour, the prime minister of that country says the plot was to bring down an airplane. ABC's Jennifer Eccleston with what we're learning. Reporter: We're learning chilling new details about those four men arrested Saturday in Australia as part of a terrorism operation. Late tonight the prime minister say the four were plotting to bring down a plane. Australian police said it was islamist inspired. They were arrested in Sydney during raids earlier today. Right now, we know that additional security measures are in place at airports across Australia. The officer of air transport security, screening will now take longer. All of those added security measures going into place as the counterterrorism operation continues. At this hour, the national terror alert level remains at high. Details are still coming in. We'll continue to follow this story. Tom. Jennifer with that breaking news from Australia, thank you.

This transcript has been automatically generated and may not be 100% accurate.