The first time Irfaan Noorudin saw the black-and-white ad equating Islam with antisemitism, he was sitting in traffic not far from the US Capitol when a bus bearing the incendiary message rolled past.

"It's still so jarring", he said, even though the ad, which also features a picture of the colonial-era mufti of Jerusalem, Amin Al Husseini, with Adolf Hitler, is only the latest in a string of ads placed on public transport across the country by anti-Islam groups.

The next time Mr Noorudin was confronted with the ad, he was dropping off his young daughter at her church-run daycare.

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