Warning: The above video is graphic and is not suitable for all audiences.ST. LOUIS (KMOV.com) – An investigation is underway after cell phone video showed a man being beaten while riding the MetroLink Monday night.According to the 43-year-old victim, a man in his early 20's asked to use his cell phone. When the victim declined to let the suspect use his cell phone, the suspect sat next to him and asked what he thought about the “Mike Brown situation.” When the victim responded that he had not thought much about it, the suspect began punching him in the face, according to the police report.

"I think it was disgusting that no one [helped]," the victim said. "People were sort of laughing and smiling about it. No one offered to help and no one attempted to call 911."Download KMOV News app: iPhone | AndroidVideo surveillance of the incident showed two other men participated in the assault, police said.When the MetroLink stopped at the Forest Park station, a security officer boarded the train and saw the assault taking place. The suspects left the MetroLink and the security guard notified police of the incident.Following the assault, the victim complained of pain to his face. He also had a laceration on his nose and bruising on his face and forehead. According to police, the victim declined to receive medical attention at the scene.Cell phone video posted to Facebook. The video is graphic and tough to watch. News 4 spoke with Metro Spokeswoman Diane Williams who said "MetroLink is safe." Williams said MetroLink spends $10 million for off-duty officers and security guards, but there has been an increase nationwide in random violence on public transportation.

The victim has started a GoFundMe page in order to buy a motorcycle and help other assault victims. The investigation is ongoing.

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