Arrests as France hunts gunmen

President Hollande has described the dead as heroes, as Gavin Hewitt reports.
Police in France have made seven arrests as they hunt for two named suspects over the deadly attack in Paris on staff at a satirical magazine.
The seven, thought to be associates or family of the suspects, were detained in the towns of Reims and Charleville-Mezieres, as well as in the Paris area.
Photos were released of two brothers suspected of involvement in the attack.
France is mourning the 12 people killed when Charlie Hebdo was targeted by gunmen shouting Islamist slogans.
A minute's silence will be observed at midday across the country and the bells of Notre Dame in the capital will toll.
Arrest warrants were issued for Cherif and Said Kouachi, said to be "armed and dangerous". A third suspect has surrendered.
Cherif Kouachi was sentenced in 2008 to three years in prison for belonging to a Paris-based group sending jihadist fighters to Iraq.