sole legitimate government. It gave three reasons for this action: that the shelling of its own people rendered Gaddafi's government illegitimate, that it still resented Gaddafi's support to Tunisian President Zine El Abidine Ben Ali during the ongoing Tunisian revolution which started in December 2010, and that Gaddafi's shelling of its territory had rendered its previous strategy of neutrality ineffective. The UN Security Council had its 6,555th meeting and the situation in Libya was discussed. The meeting did not result in any decisions, since the council heard the statement made by the African Union Ad Hoc High-Level Committee on Libya. 17 June Rebels rejected Gaddafi's proposal to hold elections in three months. The Swedish Parliament withdrew three fighter jets and sent marines to Libya. Sweden extended participation in the NATO Libya mission. Italy signed an accord with the head of Libya's interim rebel government on Friday to jointly tackle a migration crisis triggered by the violence. 18 June NATO said Libya was using mosques as shields. 19 June At least five people died in a NATO air strike that hit a house in Tripoli, Libyan government officials said. NATO admitted that it accidentally hit a civilian neighborhood in an airstrike. Citing multiple sources, CNN reported that several anti-Gaddafi protests took place in Tripoli on 17 June, with protesters numbering in the hundreds. Pro-Gaddafi forces opened fire on the protesters with live ammunition, resulting in three deaths. 20 June Rebels claimed to have cut off the supply of crude oil to Zawiya from the Awbari oil field at Rayayna. The European Union toughened its sanctions on Gaddafi's government by adding six port authorities controlled by Gaddafi's forces to its asset-freeze list, stating that Gaddafi "had lost all legitimacy to remain in power". Gaddafi government officials claimed that NATO killed 19 civilians in the town of Sorman, west of Tripoli. This came only a day after NATO admitted to accidentally killing civilians in a separate airstrike in Tripoli. NATO stated that the target in Surman was a military command and control node. 21 June An unmanned NATO MQ-8 helicopter drone crashed due to enemy fire near Zliten while conducting reconnaissance. 23 June Advancing rebels in the Nafusa Mountains discovered supplies left behind by the fleeing Gaddafi troops, which included Turkish humanitarian food rations which were discovered to have been manufactured in a factory in Turkey after the UN sanctions were in place,