alison kosik, thank you so much. brynn gingras has a witness. let's listen in. >> -- and that's when i got interested and i turned around to go see what happened and at that point i saw a man laying on the ground who appeared to have been shot, and right next to him there was another man who was being arrested. he wasn't putting up a fight. he was on his knees, had his hands on his head, and right next to him was the white pickup truck. it had home depot logos on it. the front was entirely smashed in and it had smoke coming out of it. at that time is when another police officer announced there was another suspect who ran into the park and they began to chase after him. the rest of the police officers that were there knowing there was an active shooter gathered everybody up and made us go across the street so we wouldn't be involved or couldn't get hurt. so that's everything that i was able to see. >> reporter: what was it like on the street, on the west side highway as this was all unfolding? >> it was a lot of panic. everyone was on their phone

your mum didn't believe there ought to be kosik thank you so much for me. this deal you got a police officer for you you got to go to. the school think it if you do don't hide it. from the stop is a welcome relief to the cramped passengers their bodies a and their stomachs are empty. jeff think only. you know. what i'm going to give them and how they want you. to do what we're going to but what is known. as a precaution they wait until daylight before setting off again. by the early morning the vaccines have been on the road for twenty two. even so sharif proceeds with caution. when. i think i'm going to be on your feet. but not. that. good judgment at these times is critical. the gamble seems to have paid off after twenty four hours the taxi arrives in kiss a do good. but luck is against them. the pharmacy is closed the ice has melted and the vaccines urgently need to be refrigerated. someone. come up with you no. no no ma'am got no no way i'm going to bus you get one foot out. the pharmacist is on his way but one passenger is tired of waiting what. that.

alison kosik is one of our cnn correspondents who is there on the scene., what's is the story? >> reporter: brooke, we are -- i am standing right on the corner of greenwich street and chambers. and i'm looking at a heavy police presence. there are emergency vehicles, at least by the half dozen if not by the dozen. there are police vehicles in the same numbers. you've got -- you've got a lot of -- you've got a lot of crime tape up. in fact, i almost just tripped on some that they just put up. they are cordoning off this entire area. down the street is a school, an elementary school, and a few blocks away from here is the 9/11 memorial. just sort of setting the scene. on either corner of the street we've got crowds of people building, watching what is happening with helicopters flying overhead. brooke? >> so let me take you back. you probably couldn't hear the eyewitness who was on just before you, and he was describing this driver coming out of this crashed, you know, white truck. do we even know -- was there a crash that involved two cars? do we know what

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