Thou hast defiled thy sanctuaries by the multitude of thine iniquities, by the iniquity of thy traffick; therefore will I bring forth a fire from the midst of thee, it shall devour thee, and I will bring thee to ashes upon the earth in the sight of all them that behold thee.
Thou hast defiled thy sanctuaries - i:e., the holy places, attributed to the King of Tyre in Ezekiel 28:14 as his ideal position. As he 'profaned' it, so God will "profane" him (Ezekiel 28:16).
Therefore will I bring forth a fire from the midst of thee, it shall devour thee - as he abused his supposed elevation amidst "the stones of fire" (Ezekiel 28:16), so God will make His "fire" to "devour" him.