It happened just after 10:30 Sunday night inside the Erie Kitchen on the 600 block of West Erie Avenue.
Police say the victims, three 19-year-old men, were involved in an altercation with an unknown male inside the restaurant.
After the altercation, the suspect left and a short time later returned, firing a handgun through the front door.
Two of the victims are hospitalized in critical condition and the third is listed as stable.
So far, no arrests have been made.
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