A People’s Liberation Army navy frigate, cruiser and replenishment vessel last week entered Australia’s maritime approaches, and travelled down Australia’s east coast this week, monitored by the navies and air forces of Australia and New Zealand.

“The civil aviation authority and Airservices Australia are aware of reports of live firing in international waters,” air traffic control agency Airservices Australia said in a statement today.

“As a precaution, we have advised airlines with flights planned in the area,” it added.

Qantas and its low-cost arm Jetstar are monitoring the air space and have temporarily adjusted some flights across the Tasman Sea between Australia and New Zealand.

Foreign minister Penny Wong said the live fire involved the Chinese task group and it was an evolving situation.

“It is, as I understand it, operating in international waters,” she said in an ABC television interview today.

“We will be discussing this with the Chinese, and we already have at official level, in relation to the notice given and the transparency, that has been provided in relation to these exercises, particularly the live fire exercises.”

The Sydney Morning Herald reported China had notified Australian authorities today they would hold an exercise off the coast of New South Wales state.

Defence minister Richard Marles did not immediately respond to a request for comment.