From CBC news:

"The U.S. military said the Americans used hand and arm signals, flashing white lights and fired warning shots to get the speeding car to stop at the roadblock.

But in an interview with Italian La 7 TV, Sgrena disputed the claim, saying "there was no bright light, no signal." She also has said the car was travelling at normal speed.

Her editor, Gabriele Polo, said Italian officials told him 300-400 rounds were fired at the car. Italian military officials said two other intelligence agents were wounded in the shooting; U.S. officials said it was only one. "