The anti-Mormon mobs occupied Nauvoo and began the forcible removal of the remaining Mormons from the city. The Trustees gave the keys to the Temple to Henry I. Young, chairman of the Quincy Committee; he promptly opened the building to the mob, who began desecrating the Temple. The Trustees' actions were clearly done under duress.
[Source: Brown, Lisle (compiler), Chronology of the Construction, Destruction and Reconstruction of the Nauvoo Temple]