I found a strange paper in an abandoned building.

Hello. The following is something I found in an abandoned building in the middle of nowhere. I decided to post this because it absolutely horrified me.
The paper is as follows: My name is David. What I'm about to write is 100% true. I should explain my self. I work at a company called fibersoft. It's a small company or rather was. I'm getting ahead of myself. I will try to hurry and write this. They are coming for me.
I woke up like any other day and went to work. I went to my desk and started to boot up my computer. "Boo!" My co-worker and best friend Michael who I had met a year prior was one for pranks and had scared the crap out of me. "You scared the **** out of me, ashole!" I said playfully. "So did you submit the report?" Michael said. At that very moment we got notifications on our phones. "The United States has surrendered, STAY INDOORS".
The intercom buzzed as my boss said. "Everyone to the break room." My boss told everyone not to panic and he fliped on the TV. Nothing. No news, nothing. He told us to go home, and finish up tomorrow.
I was the first to the doors. I noticed something strange outside. The sky was dark really dark. As if it were midnight in the middle of nowhere.
I started to panic. It had only been 30 minutes and it was only 9 am. It was never this dark. I didn't even try the doors. I was paralyzed. Mesmerized by the darkness. One of my co-workers pushed on the doors. Nothing. It was stuck. I looked around. People were in a panic. We were stuck.
I looked again outside and saw a strange silhouette. It looked like a man. I say looked like because of it's abnormal limbs. A very long, and sharp left arm. It's body was completely black. As soon as I saw it I wanted to vomit.
I ran to the nearest bathroom. Luckily, I didn't vomit. I looked back out into the lobby. Went up to the doors. And what I saw sent shivers down my spine. Michael was hanging in the tree outside our building. The branch went through the back of his head, out his mouth.
Suddenly the sky turned red a blood red and it seemed as though the earth was ripping itself apart. The creature was visible again. I screamed. It was getting closer.
The lights started to flicker. I ran down the lobby. The sound of glass breaking stopped me in my tracks. I thought about my phone. I'll call 911! "We're sorry. Your call has been forwarded to an automatic voicemail..." "No no no! This can't be happening." Black. It was pitch black.
Screams echoed the halls. Some sounded very unnatural. A clicking sound started. First it was far away. Then it started getting louder. I realized it was much closer.
I sat up, and started to walk blind in the dark. I saw a light in the distance. I started to walk towards the light, but a head popped out in front of the light. It was black. It had no face. I gagged. It smelled like rotting flesh. I saw legs above the thing. But I couldn't make out anything else. The thing started to walk towards me. Slowly at first. Then almost a full sprint.
I ran into something. It was my boss. He looked at me as if I were a ghost. He said nothing. Just waved. I decided to follow him. He flipped the breaker. And the lights turned on again. I could see his neck was wrapped. His vocal cords had been cut. We heard an ear piercing scream. It sounded like a wild animal. We started to run towards his office. The thing was sprinting at impossible speeds. It stabbed right into my boss's chest
I quickly opened the door and locked it behind me. I looked around. It was dark. No windows that led outside. There was a computer and a printer. I searched the drawers. A small hand gun. I looked out the window of the door. I saw no creature. Only my boss's dead body.
Something strange started. His skin it was turning pale. I knew that was normal. I was about to look away when something peculiar. His skin went to grey, then it was completely black. His arm. It started to grow. It looked like a blade. His body jerked upwards. He no longer had a face he, it stood.
The thing no longer resembled any human being. It's head turned towards me. It let out a blood curdling scream. Suddenly there were 3 more of them. In total I saw 4 of them. They walked in my direction. I quickly barricaded the door with a file cabinet. I opened the printer and took some of the paper. There banging on the door. I know they are going to kill me.
My love I'm sorry I will not be coming home. To my unborn son, I love you and I'm sorry I can't be there to watch you grow up. I'm sorry I will never see your face.
To any one who finds this please send it to (addresses removed)
Update: I know I just posted this but I was looking into it and found an old website fibersoft.net. under employees is a David Smith and a Michael Green. Funny my name is Sean Smith and my father went missing before I was born. Weird coincidence. If you find anything else on fibersoft I'd love to know.


Source.