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In page Temple Mount:

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In 1867, a team from the Royal Engineers, led by Lieutenant Charles Warren and financed by the Palestine Exploration Fund (P.E.F.), discovered a series of tunnels near the Temple Mount. Warren secretly[citation needed] excavated some tunnels near the Temple Mount walls and was the first one to document their lower courses. Warren also conducted some small-scale excavations inside the Temple Mount, by removing rubble that blocked passages leading from the Double Gate chamber.