![](https://ichef.bbci.co.uk/news/1024/branded_news/49D7/production/_123630981_stl.png)
After collecting evidence, the UN and Lebanon set up the Netherlands-based STL in 2007 to investigate the bombing. Four Hezbollah operatives were ultimately put on trial in absentia – Ayyash, Merhi, Oneissi and Assad Hassan Sabra. A top Hezbollah military commander, Mustafa Badreddine, was also indicted until he was killed in Syria in 2016.