EUROPEAN newspapers are being attacked for republishing Mohammed cartoons from the French satirical paper Charlie Hebdo.

German newspaper Hamburger Morgenpost was firebombed on Saturday after splashing three cartoons on its front page with the headline, “This much freedom must be possible!”

“Rocks and then a burning object were thrown through the window,” a police spokesman said. “Two rooms on lower floors were damaged but the fire was put out quickly.”

Police said two people had been detained, while state security had opened an investigation.

Whether there was a connection between the Charlie Hebdo cartoons and the attack was the “key question”, the police spokesman said, adding that it was “too soon” to know for certain.

Police declined to provide further information about the suspects.

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Meanwhile in Belgium on Sunday, the offices of French-language daily Le Soir were evacuated after the paper received an anonymous bomb threat.

“An anonymous caller made threats against the editorial side of the paper, after which it was decided to evacuate the building,” Maroun Labaki, in charge of the paper’s foreign pages, told the Belga news agency.

The caller told journalists the bomb was “going to go off in your newsroom,” Le Soir journalist Martine Dubuisson tweeted.

Police closed off the road around the paper’s offices.

La rédaction du Soir évacuée suite à un coup de fil menaçant: "ça va péter dans votre rédaction, vous ne nous prenez pas au sérieux" — Martine Dubuisson (@mad_soir) January 11, 2015

The publications were just two of many European papers that reprinted cartoons from Charlie Hebdo including some mocking the prophet Mohammed.

Two Islamic jihadists stormed the offices of Charlie Hebdo on Wednesday, killing 12 people including some of France’s best-loved satirists. Both men were killed on Friday in a standoff with police.

Bild am Sonntag newspaper reported earlier on Sunday that the bloodshed in France could signal the start of a wave of attacks in Europe, citing communications by Islamic State leaders intercepted by US intelligence.

Shortly after the bloodbath in Paris, the US National Security Agency had intercepted communications in which leaders of the jihadist group announced the next wave of attacks, the tabloid said, citing unnamed sources in the US intelligence services.