Chicago police and the Chicago Transit Authority are looking for two suspects wanted for a robbery on a Red Line train early Sunday morning.

Authorities say the offenders approached a passenger at 2:42 a.m., taking possession of his money and beverage.  

When the victim approached the offenders to retrieve his money, the victim was struck in the head with a bottle.

The bottle was an unopened bottle of wine, according to NBC Chicago. The brazen attack has reportedly gone viral after footage was posted to social media.

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Female CTA assault suspect

The female suspect in a Chicago Red Line robbery was wearing a white, hooded; a multi-colored hoodie; and black, ribbed pants. (Chicago PD)

"This kind of behavior is absolutely reprehensible and should not happen to any CTA customer," officials told the TV station. "CTA began working very closely with CPD immediately after the incident was reported, including sharing relevant video from our security camera system."

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Male CTA assault suspect

The male suspect in a Chicago robbery on the Red Line was wearing a white, multi-colored shirt; purple hoodie; and black pants with a stripe on each leg. (Chicago PD)

Chicago PD recommends people always be aware of their surroundings and dial 911 to report suspicious activity immediately.

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Anyone with information about the suspects pictured above or the attack is asked to call the Bureau of Detectives — Mass Transit at 312-745-4443. Anonymous tips can be submitted online with reference identification JF-408480.