But millions of Muslims across the globe have a soft spot for such hoaxes. Conspiracy theories are rife in both Muslim-majority countries and Muslim communities here in the west. The events of 9/11 and the subsequent “war on terror” unleashed a vast array of hoaxers, hucksters, and fantasists from Birmingham to Beirut.

On a visit to Iraq in 2002, I met a senior Islamic cleric who told me that Jews, not Arabs, had been responsible for the attacks on the World Trade Center and the Pentagon. He loudly repeated the Middle East’s most popular and pernicious 9/11 conspiracy theory: that 4,000 Jews didn’t turn up for work on September 11, 2001 because they had been forewarned about the attacks.

There is, of course, no evidence for this outlandish and offensive claim. The truth is that more than 200 Jews, including several Israeli citizens, were killed in the attacks on the twin towers. I guess they must have missed the memo from Mossad.