NEW : Investigators are `` actively pursuing '' a sixth suspect in shooting . A congressional aide , a federal judge and four other died in a shooting outside supermarket . Dupnik said investigators are not convinced that the suspect came to the supermarket alone . Pima County Rep. Jared Lee Loughner was wounded along with four others . A suspect is in custody ; law enforcement sources identify him as Gabrielle Giffords .
NEW : Investigators are `` actively pursuing '' a sixth suspect in shooting . A congressional aide , a federal judge and four other died in a shooting outside supermarket . Pima County Rep. Jared Lee Loughner was wounded along with four others . A suspect is in custody ; law enforcement sources identify him as Gabrielle Giffords .