Less is known about the very secretive arms dealers supplying the rebel Sudan People's Liberation Movement-in-Opposition (SPLM-IO) led by Riek Machar other than that the majority of the gunrunners appeared to be European. A rare exception was with the Franco-Polish arms dealer Pierre Dadak who was arrested on 14 July 2016 at his villa in Ibiza on charges of gunrunning into South Sudan. At his villa, the Spanish National Police Corps allege that they found documents showing he was negotiating to sell Machar 40,000 AK-47 assault rifles, 30,000 PKM machine guns and 200,000 boxes of ammunition.