Artikel 3:103 Alternative causes

In case of multiple activities, where each of them alone would have been sufficient to cause the damage, but it remains uncertain which one in fact caused it, each activity is regarded as a cause to the extent corresponding to the likelihood that it may have caused the victim's damage.

If, in case of multiple victims, it remains uncertain whether a particular victim's damage has been caused by an activity, while it is likely that it did not cause the damage of all victims, the activity is regarded as a cause of the damage suffered by all victims in proportion to the likelihood that it may have caused the damage of a particular victim.