Don't be deterred by terror: Aust leaders

The nation's political leaders are urging Australians not to be deterred by terrorism threats after a deadly attack in Paris.

With heightened concerns about potential attacks in Indonesia, India and Turkey, Prime Minister Tony Abbott vowed to defend "our way of life, our values".

"My plea to Australians, home and abroad, is do not let terror deter you from living your normal life," he told reporters in Adelaide on Thursday.

But Australians travelling to France have been advised to register with the Smartraveller website after authorities there raised the terrorism alert to its highest level.

Foreign Minister Julie Bishop said everyday life should not be adjusted in response to brutal attacks because that would be a win for terrorists.

"What they're trying to do is cower people, terrorise people to adopt their way of life and we won't do that," she told reporters in Perth.

Acting opposition leader Tony Burke was of a similar mind.

"We don't change who we are, no matter what sort of campaigns are brought against us by these sorts of thugs," he told reporters in Sydney.

The French ambassador to Australia said he was heartened by the response of his fellow countrymen following the attack on the offices of satirical magazine Charlie Hebdo, which left 12 people dead.

Thousands of people had rallied in France's biggest cities to show they stood united against terrorism, Christophe Lecourtier said.

Freedom of the press and freedom of expression were universal values that were very important to the French, he said.

"This is what the terrorists have tried to kill."

Bouquets have been placed outside the French consulate in Sydney while flags there and at the embassy in Canberra are flying at half-mast.

A gathering in Sydney's Hyde Park at 10pm on Thursday will coincide with a minute's silence across France and similar vigils elsewhere in Europe.

Mr Abbott linked the Paris attack to Islamic State, saying it demonstrated the extent to which the jihadist group had declared war on the whole world.

"These people, they are in love with death, as was demonstrated by the Martin Place siege in Sydney," he said.

Other federal politicians were even more strident.

Nationals MP Andrew Broad did not mince his words: "May they hunt down and catch these scum," he tweeted.

Cabinet minister Malcolm Turnbull said the "murderous attack" on the offices of the weekly magazine was an attack on every free society and every journalist.

Nationals senator Matthew Canavan asked what kind of "deformed ideology" thought it brave or honourable to shoot unarmed and innocent people.

"It reflects their cowardice and weakness," he said.

Former prime minister Kevin Rudd said the attack was "beyond obscenity".

An Australian counter-terrorism expert believes the gunmen involved in the attack almost certainly had combat experience and were probably linked to Islamic State.

"This is something that seems to be the work of professionals," Monash University professor Greg Barton said.

Foreign fighters who made it through combat experience overseas and returned home were "much, much more dangerous and radicalised".

"They have practical, tactical tradecraft they didn't have previously and this pattern seems to fit the darkest fears we have about Islamic State," Prof Barton said.

Mr Abbott said there was no information to suggest an imminent threat to Australia as a result of the Paris attack.

The Department of Foreign Affairs says Australians in Paris should remain vigilant and follow the instructions of local authorities.

Earlier in the week, Australian travellers were warned that terrorists might be planning attacks in Indonesia following US government warnings.

Indian authorities have also warned of possible terrorist attacks in Mumbai.

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