The group behind a recent spate of inflammatory advertisements throughout the transit system said this week that it planned to make its biggest purchase yet: the space beside each of the roughly 220 clocks hanging in New York City's subway stations.

The advertisements depict the twin towers, engulfed in flames, beside a quote attributed to the Koran: "Soon shall we cast terror into the hearts of the unbelievers."

The clocks are suspended from ceilings above subway platforms in stations across the city.

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