On 11 April 2002, ten countries ratified the statute at the same time at a special ceremony held at the United Nations headquarters in New York City, bringing the total number of signatories to sixty, which was the minimum number required to bring the statute into force, as defined in Article 126. The treaty entered into force on 1 July 2002; the ICC can only prosecute crimes committed on or after that date. The statute was modified in 2010 after the Review Conference in Kampala, Uganda, but the amendments to the statute that were adopted at that time are not effective yet.