Bombing Eyewitness: Blood, Mayhem and a Collective Scream

Charles Krupa/AP

updated 04/15/2013 AT 7:00 PM ET

originally published 04/15/2013 AT 4:45 PM ET

In the chaos after the deadly explosions that rocked the Boston Marathon finish line, runners and eye witnesses took to social media to share their experiences.

Jeff Chin, 27, of Boston gave his first-person account of watching the terror unfold to PEOPLE’s Steve Helling:

I was near the Apple Store, heading to the Dunkin Donuts when I heard it. I was maybe a block away from it, and it was really loud, like a lightning strike had hit really close. And then I heard another one.

People started screaming. I saw a guy with his shirt off, and it was wrapped around his hand and it was soaked red with blood, but I don’t think he had lost it. I didn’t look too closely.

I saw a woman fall down as she was running away; she was trying to get up and people were stepping all over her, trampling her. She was screaming in pain, but also I think she was terrified.

She was trying to get up, and I saw a guy step right on her hand and she screamed out. I was going over to help her, and then another woman helped her get on her feet.

There was a woman carrying a girl who was maybe 8 years old, way too big to be carried. The girl was screaming, I’ll never forget how it sounded. She was screaming, not any words, but just shrieking and kicking and flailing. And I saw that there was blood, but I don’t know if it was the mother or the girl. The girl was just terrified.

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