Gendron pleaded not guilty and was revoked bail while awaiting the next court appearance at 0930 ET Thursday. The 18yo white male told the judge, "I understand my charges."

Local, state, and federal authorities say they're investigating the mass shooting as a racially motivated hate crime. Police said eleven of the 13 shooting victims at the Tops Friendly Market are Black. 

Erie County Sheriff John Garcia said Gendron's attack on the supermarket was "pure evil." Erie County District Attorney John J. Flynn said investigators had found evidence showing "racial animosity" was behind the shooting. The FBI is also investigating the incident as an act of racially-motivated violent extremism. 

According to NYTimes, investigators were examining a "manifesto" believed to have been written by Gendron that was posted online.