A German newspaper that republished controversial cartoons from the French newspaper Charlie Hebdo was firebombed on Sunday.

Hamburger Morgenpost, a leftist newspaper based in Hamburg, republished some of the Charlie Hebdo cartoons on Jan. 8 under the headline “This much freedom must be possible!” The attack came at about 2 a.m. local time on Jan. 11.

The courtyard of German regional newspaper Hamburger Morgenpost in Hamburg on Jan.11 after an arson attack. (Bodo Marks/Agence France-Presse/Getty Images)

Several stones and a molotov cocktail were found in the paper’s basement, the Associated Press reported. Two men in their 30s, who were not named by authorities, were detained near the paper after the attack.

Fortunately no one was injured in the fire, and the damage is very limited,” the paper wrote.

Authorities did not directly link the attack on Hamburger Morgenpost to Charlie Hebdo — where Islamic militants killed 12 in Paris on Jan. 7 — or religious extremism.

“The background of the action is still unclear,” the paper said.

But Twitter was making the connection already.

Some other German papers that republished the Charlie Hebdo cartoons are now under police protection.

The attack came less than 24 hours after German Chancellor Angela Merkel condemned the attack on Charlie Hebdo on Saturday in Hamburg.

“We have made clear that the events in France, this barbaric terrorist act, are a challenge for all of us, for the values that we advocate, to fight for them,” Merkel said, the Independent reported.

A burned copy of the paper in front of the building. (Fabian Bimmer/Reuters)

Many news organizations around the world — including The Washington Post, which put a Charlie Hebdo cover depicting the prophet Muhammad in its editorial pages — republished images from the magazine after last week’s attack.

“I think seeing the cover will help readers understand what this is all about,” Fred Hiatt, the Post’s editorial page editor, said.

Here are pictures of Hamburger Morgenpost after the attack from Reuters: