A spokesman for the cartoonists said: "They are in hiding around Denmark. Some of them are really, really scared. They don't want to see the pictures reprinted all over the world. We couldn't stop it. We tried, but we couldn't." Mogens Blicher Bjerregaard, president of the Danish Union of Journalists, told The Times: "They are keeping a very low profile. They are very concerned about their safety. They feel a big responsibility on their shoulders. It's blown up so big. It is tough for them."

The cartoonists' names were originally printed in the Danish paper Jyllands-Posten. Flemming Rose, the paper’s cultural editor, invited 25 newspaper cartoonists to draw a picture of Muhammad "how they saw him," after a children's author complained that cartoonists would only dare illustrate a book he was writing on the life of Muhammad if they could be anonymous. Twelve cartoonists responded, had their pictures printed in September, and were paid 800 Danish krone (£73) each.

In an interview with a Swedish newspaper this week, some of the cartoonists expressed their doubts about the entire episode. "It felt a little like a lose-lose situation. If I said no, I was a coward who contributes to self-censorship. If I said yes, I became an irresponsible hate monger against Islam," one of the cartoonists said.

Another said: "I was actually angry when I first received the letter [from Jyllands-Posten]. I thought it was a really bad idea. At first I didn't want to participate, but then I talked it over with some friends from the Middle East, and they thought I should do it."