31.   But intelligence officials cautioned that most of the surveillance so far has been devoted to finding targets and assessing damage, not seeking evidence.

32.   But local officials caution that any cause for celebration may be short-lived.

33.   But officials cautioned that they had not determined how many of the complaints involved tires that had failed.

34.   But officials previously cautioned that there has been no hard evidence linking Bin Laden or his agents to the bombings.

35.   But one Israeli security official cautioned that Hamas might not be responsible.

36.   But officials cautioned that the risk associated with cross-contaminated mail appeared to be extremely low.

37.   But officials cautioned that with high temperatures, low humidity and strong winds forecast for later Wednesday night, the fire could still be dangerous.

38.   But since jurisdictions define hate crimes differently and reporting is voluntary, White House officials cautioned that those numbers were unreliable.

39.   But state officials cautioned that early estimates were just guesswork, and the correct number remains unknown.

40.   But officials also cautioned that some of the dead are fighters of the Kosovo Liberation Army or may have died ordinary deaths.