A St. Louis train rider is attacked over his response to a question about the shooting death of Michael Brown in Ferguson, Mo., last August.
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St. Louis police are searching for an African-American man in his 20s who assaulted a white man Monday supposedly for declining to answer a question about Michael Brown, the unarmed black 18-year-old who was fatally shot last August by a white police officer in Ferguson, Mo., CNN reports.

The attack occurred late Monday aboard a light-rail car in St. Louis after the assailant asked the victim his opinion about the Brown shooting, CNN writes. When the man declined to answer, the assault began, police say. Two more black men joined in the beating, according to a police report.

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The attack was caught on surveillance cameras on the MetroLink train, and a passenger recorded the scene with a cellphone camera and posted the video online.

Watch the video here. Some may find it disturbing:

Read more at CNN.