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The following Sunday, Blackwater guards opened fire as the State Department convoy they were escorting crossed in front of stopped traffic at the al Nisour traffic circle.

    While U.S. officials have offered no explanation of what occurred that day, witnesses and Iraqi investigators agree that the guards' first target was a white car that either hadn't quite stopped or was trying to nudge its way to the front of traffic.

    In the car were a man whose name is uncertain; Mahasin Muhsin, a mother and doctor; and Muhsin's young son. The guards first shot the man, who was driving. As Muhsin screamed, a Blackwater guard shot her. The car exploded, and Muhsin and the child burned, witnesses said.

    Afrah Sattar, 27, was on a bus approaching the square when she saw the guards fire on the white car. She and her mother, Ghania Hussein, were headed to the Certificate of Identification Office in Baghdad to pick up proof of Sattar's Iraqi citizenship for an upcoming trip to a religious shrine in Iran.

    When she saw the gunmen turn toward the bus, Sattar looked at her mother in fear. "They're going to shoot at us, Mama," she said. Her mother hugged her close. Moments later, a bullet pierced her mother's skull and another struck her shoulder, Sattar recalled.

    As her mother's body went limp, blood dripped onto Sattar's head, still cradled in her mother's arms.

    "Mother, mother," she called out. No answer. She hugged her mother's body and kissed her lips and began to pray, "We belong to God and we return to God." The bus emptied, and Sattar sat alone at the back, with her mother's bleeding body.

    "I'm lost now, I'm lost," she said days later in her simple two-bedroom home. Ten people lived there; now there are nine.

    "They are killers," she said of the Blackwater guards. "I swear to God, not one bullet was shot at them. Why did they shoot us? My mother didn't carry a weapon."

    Downstairs, her father, Sattar Ghafil Slom al Kaabi, 67, sat beneath a smiling picture of his wife and recalled their 40-year love story and how they raised eight children together. On the way to the holy city of Najaf to bury her, he'd stopped his car, with her coffin strapped to the top. He got out and stood beside the coffin. He wanted to be with her a little longer."

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