11.  An unknown number of people were evacuated from subway tunnels.

12.  An unknown number of refugees have found shelter in the homes of others who live near the conflict, while some have been able to reach nearby towns.

13.  An enemy vehicle is moving slowly up the road, shielding an unknown number of infantry.

14.  An unknown number of American sheep are infected with scrapie, which, like mad cow disease, is a spongiform encephalopathy.

15.  An unknown number of gypsies also were sterilized, he admitted.

16.  An unknown number of others died later from their exposure to radiation.

17.  An unknown number of people associated with the highjackers have been detained and arrested for immigration violations, said Mindy Tucker, spokesperson for the Justice Department.

18.  An unknown number of pro-democracy demonstrators were killed when tanks rolled in to quell six weeks of protest.

19.  An unknown number are abandoned.