French soldiers patrol near the Louvre Museum in Paris as part of the highest level of "Vigipirate" security plan January 8, 2015 the day after a shooting at the Paris offices of Charlie Hebdo. French police extended a manhunt on Thursday for two brothers suspected of killing 12 people at a satirical magazine in Paris in a presumed Islamist militant strike that national leaders and allied states described as an assault on democracy. France began a day of mourning for the journalists and police officers shot dead on Wednesday morning by black-hooded gunmen using Kalashnikov assault rifles. French tricolour flags flew at half mast throughout the country. REUTERS/Gonzalo Fuentes (FRANCE - Tags: CRIME LAW)