Mayor Dave Bing’s bodyguard is being treated for a knee injury after a fall at the Manoogian Mansion today in Detroit. Mayor spokeswoman Naomi Patton, said the executive protection agent was taken by ambulance to a local hospital between 6 a.m. and 6:30 a.m. She did not know the extent of the injury, but said he remained at the hospital this morning. Patton also stated that the mayor was not involved in the incident