Police arrested three men on Saturday in connection with a fire at the offices of the publisher of a book about the Prophet Mohammed and his child bride.
But the radical cleric Anjem Choudhary, who lives in Ilford, east London, said he was "not surprised at all" by the attack and warned of possible further reprisals over the book.
"It is clearly stipulated in Muslim law that any kind of attack on his honour carries the death penalty," he said.
"People should be aware of the consequences they might face when producing material like this. They should know the depth of feeling it might provoke."
He denied any involvement in the attack but said he "understood" the feelings of the perpetrators.
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