21.   But officials Tuesday refused to rule out any possible motive for the letters.

22.   But there is another possible motive for his restraint.

23.   But they have offered no possible motive or evidence.

24.   Citing a possible motive to leave the country, they point to a multibillion-dollar civil judgment against Keating won by investors in his junk bonds.

25.   Detective Martinez said he had no information on a possible motive for the killing.

26.   Federal investigators have declined to disclose a possible motive, but Martz said Tuesday that it was not racial.

27.   Freeh and other American officials said it was still too early to speculate about who might have ordered or carried out the attack, or on possible motives.

28.   He also declined to speculate on possible motive in the matter, and maintained there was no evidence of Russian involvement.

29.   He declined to discuss a possible motive for the murders.