 Domestic threats continued to plague Gaddafi; in May 1984, his Bab al-Azizia home was unsuccessfully attacked by a militia—linked either to the NFSL or the Muslim Brotherhood—and in the aftermath 5,000 dissidents were arrested.Libya had long supported the FROLINAT militia in neighbouring Chad, and in December 1980, re-invaded Chad at the request of the FROLINAT-controlled GUNT government to aid in the civil war; in January 1981, Gaddafi suggested a political merger.The Organisation of African Unity (OAU) rejected this and called for a Libyan withdrawal, which came about in November 1981.