11.   Bioterrorism experts say a suicidal terrorist who intentionally infected himself could cause mass casualties simply by walking through Manhattan.

12.   A bomb explosion last year caused no casualties.

13.   A substantial amount of liquid mustard gas dispersed in a subway or building could cause casualties for years, unless every nook and cranny were scrupulously decontaminated.

14.   A Republican splinter group claimed responsibility for the bombing, which caused no casualties.

15.   A spokesman for the group in Beirut said that three rockets had hit a logistics office, causing no casualties.

16.   Allied officials acknowledged that bombing units scattered around the province might cause civilian casualties too, but said pilots would do their best to minimize the effects.

17.   Bradley says he also was fearful that a surprise head-on meeting with the Canadians would cause casualties, because of recognition mistakes.

18.   But superior American numbers also meant that when bombs went off target and caused civilian casualties, they were bombs dropped from American planes.

19.   But the number of potential perpetrators of biological warfare is growing, as is the number of lethal agents that could cause extensive casualties.

20.   But those bombings failed to cause large-scale casualties.