NEW : Families of victims make statements . Civil rights leader Jesse Jackson , who visited the gurdwara on Thursday , said more massacres will come unless the United States tightens up its gun laws . Attorney Eric Holder says the attack was contrary to American values . Mourners hold an emotional memorial service in a high school auditorium . Six Sikhs were killed in the shooting attack at their home last Sunday .
NEW : Families of victims make statements . Attorney Eric Holder says the attack was contrary to American values . Mourners hold an emotional memorial service in a high school auditorium . Six Sikhs were killed in the shooting attack at their home last Sunday .