The victim's son and daughter were on the on the news last night- both were black. Additionally, they showed a shot of the victim taken with the daughter's cell phone camera, and that showed he is black.
No real info on the attackers, except that there have been several arrests made. Apparently the ages of the attackers range between 16 and 23.
correction: No arrests have been made. People are being held, but not officially arrested. I must have misheard the earlier news on the radio.