"Nobody does a bigger disservice to Muslims & Islam then the those who go around murdering people in the name of my religion(sic)," Omar wrote on micro blogging website Twitter.

At least 12 people were killed when gunmen armed with Kalashnikovs and a rocket-launcher opened fire in the offices of French satirical weekly Charlie Hebdo on Wednesday, said sources close to the investigation.

The government raised its alert level to the highest possible in the greater Paris region.

A source close to the investigation said two men "armed with a Kalashnikov and a rocket-launcher" stormed the building in central Paris and "fire was exchanged with security forces."

The source said a gunman had hijacked a car and knocked over a pedestrian while attempting to speed away.

However, Two policemen were gunned down on Thursday near Porte de Chantillon, south of Paris. According to media reports, they were seen lying on the ground.

A suspect has been arrested, a police source said. French Interior Minister Bernard Cazeneuve quit his emergency inter-ministerial meeting in the Elysee Palace and is on his way to the scene. Some other reports said one officer was seriously wounded. There is no link confirmed with Wednesday's attack on Charlie Hebdo magazine.

Seven people have been detained in the hunt for brothers suspected of gunning down 12 people in an Islamist assault on a satirical weekly, a judicial source said.

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