monique griego is live outside city police headquarters. good morning. >> reporter: good morning don and everyone. there are similarities between the invasions, investigators aren't sure if the cases are linked. police say groups of men are impersonating officers to get inside homes across the city to rob them. the trend began in july when houses in federal hill and edner gardens were targeted. their residents were beat up or shot. >> preyingen the betrusted victims. >> it scares the pants off of me. bought a dead bolt that locks from both sides. >> reporter: the latest was yesterday morning. three men broke in to a home on hill dale avenue while shouting police raid. one man broke free and was shot in the face leaving him hospitalized in stable condition. >> if they are and you don't do what they say, you are in trouble. if you do what they say and they are not, then you are in trouble. it's like, what are you supposed to do? >> individuals that do not have a history of criminal offenses, no prior contacts with police, police officers will