It seems as though Tony Allen and Will Bynum were in a restaurant in Chicago (celebrating Will's contract with the C's) and a shooting occured there that night. Police want to question Allen because, as the article states:
A Hinsdale man -- who sources said may have been in an earlier dispute with Allen -- was wounded in the shooting.
However, the article also states:
Police are not calling Allen a suspect, and he has not been accused of any wrongdoing.
So hopefully this is nothing.