It was most likely the ICC, the UNSC is the only body that can instruct the ICC to start a tribunal and that&#x27;s the role that the ICC plays for in the whole UN eco-system opening a completely separate international criminal tribunal to would be a bit odd especially since it won&#x27;t have any mandates and I&#x27;m not even sure if the UNSC can do that.<p>P.S.
The Lockerbie trial wasn&#x27;t an international tribunal, or an international trial it was awkwardly constructed due to the fact that neither the US nor the UK had a working extradition treaties with Libya and the case was not turned over to the ICC.<p>The trial was conducted in the Netherlands yes but under Scottish law and that&#x27;s because the dutch did had an extradition treaty with Libya as well as some weird treaty with presumably either the UK, the commonwealth or even historically the Kingdom of Scotland which allowed them to establish a Scottish court on dutch grounds.