Why are Dutch soldiers being sued for the massacre at Srebrenica?

Relatives of the dead have brought a civil action alleging that the Dutch state is liable for the deaths of 8,000 Muslim civilians who were executed when Bosnian Serb forces overran the town during the Bosnia War in July 1995. It was the worst atrocity in Europe since the Second World War. The case, which has been three years coming to court, is being heard in The Hague this week. Relatives have demanded $1bn compensation.