found him. >> reporter: video shows a man, identified as a 35-year-old, sexually assaulting the woman. the video also shows witnesses sitting there doing nothing. >> it's disturbing that there were definitely people on the "l." and nobody intervened or did anything to help this woman out. >> reporter: riders we spoke with are also disturbed by the witnesses' lack of action. >> it makes me sick, everybody saw but didn't do everything. >> that's crazy. nobody said nothing, nobody did anything? that's ridiculous. if you see something, say something. >> reporter: burnhart says it's not too late to do just that. they're asking for anybody who may have seen something to come forward. >> we're working to see what people saw and trying to identify them and get information from them as well. >> that was wcau's brian sheehan reporting. joining me from philadelphia is