The offices of a German newspaper in Hamburg that reprinted Charlie Hebdo cartoons of the prophet Mohammed was hit by an arson attack early Sunday, police said.

Unidentified assailants threw stones and an incendiary device at the Hamburger Morgenpost around 2 am (0100 GMT).

Police in the northern German port city said a fire broke out in the newspaper’s archive room but that it was quickly extinguished and no one was injured.

“There is still no evidence, no claim of responsibility or other information” that connects the attack to the cartoons published on its front page this week, police spokeswoman Karina Sadowsky said.

Two young men who were in the area at the time of the attack and were said to be behaving suspiciously were detained by police.

The Hamburger Morgenpost ran on its front page three covers from the French satirical magazine Charlie Hebdo that depicted the prophet Mohammed. “This much freedom must be possible!” said the headline of the Hamburg newspaper.

An attack on Tuesday at the Paris offices of Charlie Hebdo left 12 people dead, including four cartoonists. SAPA