CNN19980202.2130.0265 NEWS CAPTION Federal agents are investigating two letters that claim responsibility for last week's bombing of a women's clinic in Birmingham, Alabama. The letters bear the name "army of God," the same person or group that claimed responsibility for two Atlanta bombings last year at a women's clinic and a gay night club. Sources say the letters contain the verification code included in the letter sent after the Atlanta bombings. One of the letters red -- earlier today, hundreds gathered for the funeral of Birmingham police officer, Robert Sanderson, who was killed in last week's blast.