Transcript for Manhunt in Cleveland for alleged gunman in Facebook Live shooting

Good evening thanks for joining us on this Sunday I'm Tom Gama said we start with breaking news as we come on the year the killing seen live on FaceBook. And all out manhunt underway now for the alleged gunman in Cleveland. Police say graphic video shows the suspect walked up to this elderly victim and opening flyer at close range. Authorities identifying the alleged gunman who posted the video he claims he has killed other victims. Nearby Cleveland State University on lockdown students told to shelter in place. And police describing the suspect as armed and dangerous the FBI now assisting. ABC he the pilgrim with a. Tonight an urgent manhunt for the suspect who appears to kill a random elderly stranger live on FaceBook. Authorities also say the man claims to have killed others. Com's mark. Sorry here won't do clean the police are looking bird this man and Steve Stevens they say he brought cast himself committing murder live on a social media page. It's. Disagree way. Usually jointly. Did and she's the real world is what Appleton. In the seconds before you pull the trigger Stephens explains to his victim he's about to shoot him because it will limit. The family says the victim was Robert Goodwin senior their 74 year old father there's. There right here was a good man. That was eight cover hey he's going. Investigators are at the scene tonight and confirm they are investigating a homicide. Police are actively searching multiple areas. It not critical. Ill yet they Wear your their anger. Out. He. We won term sultan will look. Until we find them. Stevens was last seen in a white Ford Fusion with temporary tags wearing a dark blue and gray or black striped polo shirt he is 601. 240 more pounds police say he is considered armed and dangerous. In a statement to ABC news FaceBook says this is a horrific crime and we do not allow this kind of con Tet on FaceBook. The company saying they are in touch with law enforcement in emergencies. When there are direct threats to physical safety beaver coat and joins us live now evil we just heard you say that the suspect claims he's killed more people. That's right time investigators say Stephens claims that he is killed multiple people. They have followed up on some leads but have not been able to verify. Any additional victims. Tom Eva pilgrim with a late breaking developments tonight Eva think.

This transcript has been automatically generated and may not be 100% accurate.