Bulgaria and Romania make up the second part of the EU's fifth enlargement, and joined the EU on 1 January 2007. This date was agreed upon at the Thessaloniki Summit in 2003, confirmed at Brussels on 18 June 2004, and affirmed by the country reports of October 2004 and the final report delivered on 26 September 2006. Bulgaria and Romania signed their Treaty of Accession on 25 April 2005 at a ceremony held at Neumünster Abbey in Luxembourg.