Iraqi officials indicated that they were weighing the earlier shootings involving Blackwater in their consideration of what the practical consequences of the Nisour Square shooting should be. “The American Blackwater company has made for the seventh time the same mistake against the Iraqis and in different places in Baghdad,” according to a preliminary report from the Iraqi investigation obtained by The New York Times.

According to General Khalaf, the other events under investigation are a Feb. 4 shooting that killed an Iraqi journalist near the Foreign Ministry; a Feb. 7 shooting in which three guards at the Iraqi state television station were killed; a Feb. 14 episode in which Blackwater employees are accused of smashing windshields; a shooting in May that killed one person near the Interior Ministry; a Sept. 9 shooting that killed five people near a Baghdad city government building; and a Sept. 12 shooting that wounded five people in eastern Baghdad.

No results of the American inquiry have been made public. For that reason, American officials have privately cautioned against drawing early conclusions.

In addition, a United States Embassy official said Saturday that investigators did not want to present incorrect results that would have to be revised, and so would let the investigation take its course before commenting. And the official said that cooperation between the two sides in the investigation was beginning and that information would begin flowing more freely.

But the official also said that embassy activities had been slowed because convoys protected by Blackwater guards had been temporarily stopped as a result of the shooting.

“Our own movements, as you know, were severely restricted and remain restricted,” the official said, speaking on condition of anonymity. “So ever since the incident took place, we have not been moving around Baghdad as we did before.”

Although the official declined to comment directly on how those restrictions may have had an impact on the American investigation, United States military personnel, who can move with their own security details, have been seen interviewing Iraqis at the scene of the shooting in recent days. If American civilian officials who are leading the investigation from the embassy are unable to move through the city, that restriction could clearly slow the work of gathering information from the scene and from witnesses.