Mary Robinson made the obvious point that where civilian casualties can be avoided, they must be avoided, and asked: "If it is not possible to ascertain that there are civilian buses on bridges, should the bridges be blown in those circumstances?"
One might also ask, if it is known that civilian staff are operating a television station, or car-workers are occupying a factory or a scheduled passenger train may be on a bridge, should they be bombed?
The 1949 Geneva Conventions state that all belligerents must do everything possible to avoid civilian targets and casualties. Where there is doubt a potential target is meant to be presumed to be civilian.
ALICE MAHON MP
House of Commons