'No country is immune': Julie Bishop warns travellers to be careful following Nice attack

Australians travelling overseas are being urged to be careful in places where crowds gather following the truck massacre in the French Riviera town of Nice.

"As this attack shows a terrorist attack can take place any time, anywhere, no city, no country is immune," Foreign Minister Julie Bishop told the TODAY Show this morning.

Some 84 Bastille Day revellers died on Thursday when delivery man Mohamed Lahouaiej Bouhlel mowed through a crowd with a truck. Scores more were injured, including a number of Australians.

"In France, we are urging people to exercise a high degree of caution," Ms Bishop said.

"We will do what we can, obviously our consular officials our embassy is working over time. These are very challenging times. People need to think very seriously about travelling overseas."

However, Ms Bishop also said governments don't want those who seek to carry out terrorist attacks to win.

"We have to be able to live our lives. We have to be careful," she said.

Two Australians remain in hospital in Nice after being injured when the crowd stampeded on the Promenades des Anglais as people tried to avoid the truck as it chased down pedestrians.

About 5000 Australians are believed to be making their way to Fromelles in France for the 100 year commemorations of the July 19 WWI battle, which marked the first major action involving Australian troops on the Western Front.