NOTE: I do not own any of the characters. Gabby is a candidate on truck, Mills is still in squad and Mcauley is added on ambulance, to avoid empty spaces ;) Please, enjoy this first chapter and I hope you want to see more.

It had not even reached the news when the call arrived at firehouse 51. They were surprised that they were called to the airport, because it was not close to 51 at all, but when they were heading there, all they heard were more sirens. Sirens everywhere, it seemed like Chicago had transformed in one giant siren. When they arrived at O'hare, all they saw smoke, firefighters running around and it took a moment for them, they all just stood there for a few seconds, their mouth open as they saw the massive chaos, the smoke and the burning airport.

Then, they didn't doubt for a minute before running in, according to orders. Matt looked as Gabby ran behind him, his fiancée and he was worried, as this seemed chaos but now she was a candidate on truck he was a little worried about her, but with all the chaos here, there was not much time to worry about her. They had to help and safe the people that could be saved, but he was scared that there would be loads and loads of victims

Severide was walking around, saw the other firefighters running around as well.

''You have to go to the gates! There is nobody there yet and that is close to where the bomb went off!'' Another lieutenant yelled and Matt and Kelly nodded and kept heading towards the gates.

''Did you hear anything about what happened?'' Matt asked worried.

''Giant explosion near the gates, they think it's a bomb.''

There were passengers still running around them, getting directed out by other firefighters and personal of the airport and they just kept heading deeper into the smoke.

Suddenly, A man came running through the group of firefighters. Before they realized the man had come running through the group they were almost run over by police officers and everything turned in chaos again.

''cpd! Stop!'' They yelled and Matt looked as Antonio came running past him.

''That man is the bomber!'' Antonio yelled and as Kelly heard Antonio yelling that, he got up and ran with the police officers, hoping they could catch up with the guy.

The firefighters all got up, surprised and confused by just had happened when there suddenly was another explosion and as they ducked, more smoke filled the room.

Cruz crawled up, a large beep in his ear but he looked at the people laying on the floor, crying and he crawled their way and helped them up and helped them towards the exit

Kelly and the officers were still chasing down the bomber and he kept running faster and faster, through the smoke and rubble. They had to catch him, they had to catch the guy that had done this.

Matt crawled up, looked around but there was dust everywhere. He looked for the yellow sign of the gate they were heading too and called through the radio, but saw that it was broken because when he had fallen to the floor, he had fallen onto it and he fel tit on his chest, but he had to keep on going, he had to help all the people he could. There wasn't even a moment to think about if Gabby was okay, there was nothing he could do right now.

Kelly kept on running, they were running by the shops now and suddenly he got pulled inside a shop. A arm was held tight around his throat and he felt a gun was put on his head and the man holding him pushed him forward.

''CPD! Drop you weapon!'' The officers said while Kelly closed his eyes, afraid for what was going to come now he knew the bomber was holding him.

''I can drop my gun, but I can also shoot him, because I know you wont shoot me while I got him.'' The bomber said and the CPD looked at the man, knew he was right, they could not shoot him while he was holding Severide under gunpoint.

Kelly closed his eyes, tried to keep breathing normally but there was nothing he could do to get himself free, the man held him tight and he did not want to get shot!

He listened to the complete silence that filled the space around them all now. The CPD was not shooting the bomber and Kelly was scared the bomber would shoot him. His heart was racing in his chest as he tried not to move, to stand here and hope the man would let him go soon.

Matt ran towards the gate, having a hard time with all the dust. He had lost most of the other men that worked on truck and not many passengers were running towards the main lobby now. The dust and smoke was getting bigger and there was fire. Matt could just manage without his mask as it was easier to look around like this. He walked around the flames, trying to get to the gate. He could hear some walking now, but didn't see a lot of people and he knew he was closer to where the bomb went off, afraid many people were dead here.

''Help me! Help!'' Matt suddenly heard and it sounded like a young girl that was calling for help. He followed the voice, trying to see anything through the smoke as he could see on the sign that he was at gate 5. Then he suddenly heard the girl again and started to run.

''Mommy! Daddy!'' He heard again and he suddenly saw her, standing up in the smoke, most of the other people laying on the floor, bleeding.

''hey, hey.'' Matt said and he kneeled down, looking worried as there was blood on her forehead.

''I am Matt, I will get you out of here. Are you okay? What is your name?'' He asked worried and she moved closer to him, almost hugging him, scared. The big firefighter was the only thing that really seemed safe now. She just wanted to see her parents.

''My name is Anna.'' She said then and she looked at him with a pout. ''My head hurts.''

''Where are your parents?'' He asked worried and she started to cry.

''I don't know I just needed to get a bottle of water.'' She cried and he lifted her up. As she was laying with her head against his shoulder.

''Wait, I need Bello.'' She said then and she pointed at the teddy, laying on the floor and he picked it up, giving it to her and as she was laying against his shoulder he walked around, slowly but most of the other people in the gate seemed to have died in the blast, but before he could really take a look, he heard a cracking noise and he dove on the floor, holding Anna in his arms and rolling under a bench, while the roof came down. Suddenly, everything seemed to be gone.

NOTE: A massive disaster at O'hare! The paramedics don't even know where to start, the firefighters got separated and Kelly is chasing the bomber while Matt is with a girl in a gate, where they are in danger by fire and falling things. Can they all stay safe inside and will they all come out?

Thank you so much for reading! I hope you liked this chapter and that you are interested in the story! Please do leave a review for this chapter again because I wonder what you are thinking and please also tell me if you would like to see more of this story.