See local coverage from CNN affiliate WGRZ-TV.
(CNN) -- Authorities have dropped charges against a 25-year-old man arrested in connection with the shooting deaths of four people outside a restaurant in downtown Buffalo, New York, police said.
Keith Johnson remains in jail on unrelated parole violations, said Buffalo police spokesman Mike DeGeorge.
The shooting Saturday also injured four others outside the City Grill in downtown Buffalo.
Earlier, Erie County District Attorney Frank Sedita told CNN affiliate WGRZ-TV that photographic evidence collected by Buffalo police late Saturday night had led them to believe the wrong person might have been in custody.
The new evidence led to doubts about Johnson's arrest, Sedita told the affiliate.
Johnson was taken into custody Saturday afternoon after police and SWAT team members raided his home.
At a news conference Saturday, Police Commissioner Daniel Derenda said that the dead -- two men and two women -- included a Texas man who was celebrating his wedding anniversary.
Patrons were asked to leave the City Grill's bar after some sort of argument, police said. About 100 people were at the restaurant when the shootings occurred outside.
City Grill posted a message on its website on Saturday, saying that it is "cooperating fully with the authorities and the ongoing investigation." It added, "Our thoughts and prayers are with the victims and their families."
CNN's John Branch and Rick Martin contributed to this report.