1.   Although a variety of hypotheses have been studied, there is no conclusive explanation for the increased risk of injury, doctors say.

2.   Neither Sherman nor police officials in New York could offer any conclusive explanation for why New York lags in the seizure of guns.

3.   The EU was moved to enter the fray in part because it says no one has turned up a conclusive explanation to explain the illnesses.

4.   The researchers say they have no conclusive explanation for the high death rate.

5.   He offers no conclusive explanation.

6.   None could offer any conclusive explanation and said full analysis would be costly and time-consuming.

7.   Researchers offered no conclusive explanation but said many people may have been literally scared to death.