one of the first cars that passes chalo's body stops on the side of the road. but vehicle after vehicle goes by and they do not stop. finally, one car blocking the lane. >> engine 288. rescue 88. dispatch auto pedestrian. intersection of sepulveda and hatteras. >> reporter: chalo was pronounced dead at the scene. >> the two cars were engaging in what we believe is street racing. >> reporter: police say tonight they are looking for this man, roberto ocampo, who they believe was driving the car at the time of the collision and considered a person of interest. >> and we just want to urge him to come forward. >> reporter: david, the lapded a viszs that if you are in a similar situation, first thing, call 911, try to get that person some medical assistance. and if it's safe, try to give that person protection with your car. david? >> matt gutman from california. thank you, matt. >>> overseas tonight, iran taking major new steps away from the nuclear deal that president trump abandoned last year, unvaming a new batch offed a venced centrifuges to speed up youranium e