El Al plane in 1978, adding he did not know who was responsible. The CIA was furious with Israel for killing one of its key contacts within the PLO. The French were outraged that Mossad had performed a targeted assassination on French soil, and began to crack down on Mossad infrastructure and operations in that country. From Mossad's perspective, the information provided by Yassin allowed them to hamper PLO operations against Israel: they managed to hack into PLO financial accounts and transfer funds from one account to another, sowing suspicions that members were stealing funds, and distracting their external operations as PLO officials tried to root out apparent moles and traitors within their organization. Mossad had been out of the loop of the secret negotiations between the Israeli government and the PLO that lead to the Oslo Accords. They had learnt of these talks via a microphone planted in the offices of Mahmoud Abbas, and when the government learned of the intercepts, according to one theory, they tipped off the PLO which then dismantled the listening devices and arrested Yassin as a traitor. Another version states, to the contrary, that it was the French who tipped off the PLO. The listening devices had been planted by Ahmad Yassin, one in an orthopedic airchair Yassin's son had had shipped from Marseilles. Given the peace talks, Yassin, the deputy to the PLO Ambassador in Tunisia Hakam Balawi, was arrested by the Tunisian authorities on 25 October 1993. He was not executed but sentenced to 15 years in prison. According to Aaron J. Klein, he was never heard of again. Legal follow-ups The Palestinian National Authority appealed the decision made by a Paris court on 9 December 2014 dismissing the case on the base of a lack of evidence. The French court of Appeal confirmed the decision on 8 October 2015. A lawyer for the plaintiffs stated that the verdict was "a simple admission that a political assassination can remain unpunished, something which can only add to the sense of resentment and injustice experienced by Palestinians." Wreath-laying Labour leader Jeremy Corbyn was present in 2014 when wreaths were laid at the graves of several Palestinian victims of violence, and photographed holding a wreath at Bseiso's gravesite. One of the graves was that of Bseiso. Four years later, his participation caused a media furore when it was cited as evidence for suspicions Corbyn was