The first wholly new stadium, the Castelão, in Fortaleza, became operational in January 2013.[9] Six of the venues were used during the 2013 Confederations Cup.[10] However, six further stadiums missed FIFA's original 31 December 2013 deadline for completed works.[11] The completion of the new Arena Corinthians was hindered by a fatal crane collapse in November 2013 that destroyed part of the stadium and killed two construction workers.[12] Slow progress at the Arena da Baixada site in Curitiba led to FIFA threatening to drop the stadium as a host venue in January 2014 unless significant progress was made during the following month;[13] after being satisfied of progress, FIFA confirmed that Curitiba would remain a host city.[14]