From the BBC:

The purported head of al-Qaeda in Iraq has offered a reward for the murder of a Swedish cartoonist over his drawing depicting the Prophet Muhammad.

The $100,000 (£49,310) reward would be raised by 50% if Lars Vilks was "slaughtered like a lamb" said the audio message aired on the internet.

The speaker, said to be Abu Omar al-Baghdadi, threatened a new offensive during the holy month of Ramadan.

Last month's cartoon showed Prophet Muhammad's head on a dog's body.