Relatives of hostages hold on March 16, 2013 placards, reading: 'Thierry, Marc, Daniel, Pierre hostages in Mali for 900 days -- we do not forget you,' during a gathering in the southern French city of Marseille to show their support for the four French hostages kidnapped by Al-Qaeda in the Islamic Maghreb (AQMI) on September 16, 2010 in Niger and held in Mali.