Transcript for Chilling 911 calls reveal terrifying moments after gasoline fueled firepit explosion
We want to turn to the moment a backyard party turned into a frightening scene. A fire pit exploding in flames badly burning a teenager and injuring others. ABC's Marci Gonzalez is here with the frantic 911 calls party Goers made to police and the dangers you need to know, Marci. Reporter: Just a terrifying situation. People who were right there, watching this nightmare unfold calling 911, and now we're hearing those desperate pleas for help for the first time and learning how this happened. Oh my god. The neighbors are having a party and something just exploded. Reporter: It started as a festive 50th birthday for mark Ramirez, but this morning, newly released 911 calls reveal the panic and chaos as the celebration outside of Phoenix, Arizona, took a disastrous turn. We can see the flames. I don't know what to do. Reporter: Ramirez's daughter's 19-year-old boyfriend Brandon Ashford pouring gasoline on this fire pit trying to get the flames to grow, but setting off an explosion. There was an explosion, and my boyfriend caught on fire. My dad caught on fire. Reporter: The inferno engulfing the teen. I was inside. We were eating cupcakes and then I heard a big bang. Reporter: Ramirez who asked not to show his face rushing outside, jumping on top of Ashford trying to extinguish the flames overtaking him. When I grabbed him, the fire came into my face. So I pull off my sweatshirt and then I get him to the ground and start rolling on him. We need somebody stat. Everybody's screaming. There are kids screaming. Reporter: Both rushed to the hospital. Ashford suffering second and third degree burns on more than half of his body. Ramirez back at home recovering from burns to his face and hands, credited with saving Ashford's life. All I wanted to do was get him on the ground and get the fire out, and save his life. I was going to save his life. Reporter: Fire officials warning how easily disasters like this can happen. The fire got bigger. It came back up into the gas can and there's still fumes trapped in the gas can and it exploded. Reporter: Three other people were also hurt in this, know not as seriously, and that 19-year-old remains in a medically induced coma. Loved ones saying he is making progress and getting a little better every day. Dan? Marci, we appreciate it, Let's switch gears now and
This transcript has been automatically generated and may not be 100% accurate.