 The MIT Police with state and local authorities , in the 2009 @-@ 2011 period , have investigated reports of 12 forcible sex offenses , 6 robberies , 3 aggravated assaults , 164 burglaries , 1 case of arson , and 4 cases of motor vehicle theft on campus ; affecting a community of around 22 @,@ 000 students and employees . 
