i want to go straight to cnn's margaret conley in new york. margaret, what more do you know about the investigation? >> reporter: fredricka, two bikers turned themselves in, one involved in the most violent part of that incident that took place here on this corner behind me on west 178th street. that's where the suv driver was cornered and the biker smashed his window, pulling him out and then they beat him. investigators are still trying to piece together what happens. the motorcyclist seen here who repeatedly smashed this car window using his helmet with a family trapped inside has been identified. authorities have also found the motorcyclist that shot this helmet cam video showing how the incident escalated from the start. he was driving an suv on manhattan west side highway. according to police, he struck a motorcycle that slowed in front of him, slightly injuring the rider. that's when other motorcyclists surrounded him. they hit and spiked the car's tires. as he escape, the car ran into three more bikers, including one critically injured

i want to go straight to cnn's margaret conley in new york. margaret, what more do we know about those that turned themselves in verses those that police are looking for for questioning. >> reporter: this is where it happened, where the suv driver pulled off the west side highway. he was trying to get away from the bikers. but it is also here on this corner of west 178th street where most of the violence took place. reginald chance seen in the video using his helmet to smash the window of the suv, that happened right here. he turned himself in, he is still being questioned, and he is in custody. we don't have charges on him yet. the other man that turned himself in, robert simms, he was caught on video also approaching the suv and trying to open the door before the suv was able to escape. he has been charged. he is facing attempted assault in the first degree, attempted gang assault in the secondary, and charged with criminal possession of a weapon we don't know what that weapon is. >> all right. and then so attempted gang assault and attempte

i want to go straight to cnn's margaret conley in new york. margaret, what more do we know about the direction of this investigation? >> fred, the two men that were caught on video making contact with the suv, well, they turned themselves in. the first man is reginald chance. he was the one seen in that video using his helmet to smash open that window of the suv. he turned himself in. he's still being questioned. and his charges are still pending. the second man, robert simms, he was the one that was caught on video trying to open up the door of the suv before it sped away. he has been charged. he's been charged with attempted assault in the first degree, attempted gang assault in the second degree, and criminal possession of a weapon. there's one more man that we should talk about here. he was also right here around 178th street but he is a man who intervened. he's a witness who stepped in harm's way to help the suv driver and his family. and that was sergio. >> i approached the man because i saw him almost dead on the floor. so what i did wa

cnn's margaret conley is in new york to tell us more. good morning. >> reporter: good morning, carol. investigators are trying to piece together who should be held accountable for the violence and as more bikers come forward and speak out, they tell their side of the story. reginald chance seen here pounding his helmet on an suv car window made his first appearance in court sunday, defiant as he flipped off reporters in court, faces charges including gang assault and assault in the first-degree and criminal possession of a weapon. his attorney says the charges are too severe. he says his client wasn't even there when alexian lien was pulled out of his car and beaten. >> my client obviously overreacted in smashing the window. beyond that he was not a participant in any assault on that victim. >> reporter: another biker, robert simms, seen here trying to open the door to the suv as it drove away appeared in court on saturday and faces some of the same charges. and we're now hearing the story of this biker, christopher cruz, who appears to

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