France raid unspeakable atrocity: Abbott

Prime Minister Tony Abbott has described the fatal shooting of 12 people at the office of a satirical newspaper in Paris as an "unspeakable atrocity".

Heavily armed men shouting "Allahu Akbar" stormed the French headquarters of Charlie Hedbo on Wednesday, killing a dozen people in what French President Francois Hollande called "undoubtedly a terrorist attack".

The assault sparked a massive man hunt as the two gunmen managed to escape, executing a wounded police officer as they fled.

The weekly newspaper had a history of causing controversy with cartoons of Islam's prophet Mohammed.

In a post on Twitter on Thursday, Mr Abbott labelled the attack an "atrocity".

"If you don't like something, you don't read it; you don't kill people you disagree with," the tweet said.

The attack comes less than a month after lone gunman Man Haron Monis took 18 people hostage during a deadly siege in a Sydney cafe.

Monis and two of his hostages, Tori Johnson and Katrina Dawson, were killed in the violent conclusion to the siege in the early hours of December 16.

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