The leader of a Christian broadcasting charity says he too was duped by the reputed producer of an anti-Islamic film that triggered violent unrest across the Muslim world.

Media for Christ, based in the Los Angeles suburb of Duarte, California, has been identified as the production company behind "Innocence of Muslims," in  which the Prophet Muhammad is depicted as a thuggish womaniser.

But its president Joseph Nassralla said the film's reputed producer Nakoula Basseley Nakoula deceived him when he called him last year to say he was "making a film about Christian persecution."

"Nakoula needed a place to film," said Nassralla in a statement relayed by conservative blogger Pamela Geller, who campaigns against what she regards as the Islamisation of the United States and other Western cultures.

"So I let him use my facility (for 10 days) that is all I did, and is  the full extent of my involvement with this project," he said in the statement,  which Geller posted Monday on her Atlas Shrugs website.

Nassralla could not be reached by telephone for comment on Tuesday.