The names of the deceased victims in the synagogue shooting will be released at 9 a.m. ET Sunday, Pittsburgh Mayor Bill Peduto told CNN’s Wolf Bitzer.
The mayor said there was "really strong insistence by the FBI that we identify everybody with 100% accuracy before giving out any information, for the families' sake."
Perduto also said security was being tightened at Islamic centers and any other group that "would feel insecure or would need additional security."
Eleven people were killed and six people were injured when a gunman entered the Tree of Life Synagogue in Pittsburgh, officials said.
The suspect was taken into custody.