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In page Bank and Monument stations:

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On 11 January 1941, during the Blitz, 111 people were killed when a German bomb hit the booking hall, with the blast travelling down the stairs and escalators to the platforms.[1] The crater, measuring 120 by 100 feet (37 m × 30 m), was covered with a Bailey bridge for the traffic to pass over. The station itself was closed for two months.