"The Seventh Incident of 14 July 1789"

Upon returning to City Hall, the now heavily armed crowd stormed that building as well, arresting the "Provost of Markets" (or mayor) and his son–in–law, another municipal official. Both men were beheaded and their severed heads were placed on pikes and paraded around, graphically illustrating both the power and the danger of popular insurrections like that of July 14th.

Source: mfr 84.587