CAIRO, Egypt — Osama bin Laden warned Europeans of a “severe” reaction to come, condemning the publication of drawings insulting to the prophet Muhammad in a new audio message posted late yesterday.

The message, which appeared on a militant Web site that has carried Al Qaeda statements in the past and bore the logo of the extremist group’s press wing al-Sahab, showed a still image of Mr. Bin Laden aiming with an assault rifle.

“The response will be what you see and not what you hear and let our mothers bereave us if we do not make victorious our messenger of god,” said a voice believed to be Mr. Bin Laden’s, without specifying what action would be taken.

The five-minute message, Mr. Bin Laden’s first this year, made no mention of the fifth anniversary yesterday of the American-led invasion in Iraq.

It came as the Muslim world marks the prophet Muhammad’s birthday today and amid the reigniting of a two-year-old controversy over some Danish cartoons deemed by Muslims to be insulting. Islamic law generally opposes any depiction of the prophet, even favorable, for fear it could lead to idolatry.

On February 13, Danish newspapers republished a cartoon showing Muhammad wearing a bomb-shaped turban to show their commitment to freedom of speech after police said they had uncovered a plot to kill the artist. Danish intelligence service said the reprinting of the cartoon had brought “negative attention” to Denmark and may have increased the risk to Danes at home and abroad.

The original 12 cartoons first published in a Danish newspaper triggered major protests in Muslim countries in 2006. There have been renewed protests in the last month.

Ben Venzke, the head of Intel-Center, an American group that monitors militant messages, called yesterday’s video a “clear threat against E.U. member countries and an indicator of a possible upcoming significant attack.”

In the message, Mr. Bin Laden described the cartoons as taking place in the framework of a “new Crusade” against Islam, in which he said the pope has played a “large and lengthy role.”

“You went overboard in your unbelief and freed yourselves of the etiquettes of dispute and fighting and went to the extent of publishing these insulting drawings,” he said, according to a transcript released by the SItE Institute, another American group that monitors terror messages. “This is the greater and more serious tragedy, and reckoning for it will be more severe.”

A senior analyst at the SItE Institute, Adam Raisman, said that the tape’s release coincides with an increased buzz in online jihadi forums calling for revenge against Europe over the cartoons.

But Mr. Raisman noted that Mr. Bin Laden’s message did not specifically mention the republishing of the cartoons, only the publishing, and it did not give any other time landmarks to prove it had been recorded since then.

Mr. Raisman also noted Mr. Bin Laden’s silence on yesterday’s fifth anniversary of the American-led invasion of Iraq.

“The tape doesn’t give any specific evidence that would allow us to determine when it was recorded,” Mr. Raisman said.