A woman holds a flag as she stands near members of the presidential guard keeping watch outside Palacio Nacional after a march to demand more information about the missing students of the Ayotzinapa Teachers' Training College 'Raul Isidro Burgos' at Zocalo Square in Mexico City November 9, 2014. The protesters marched 180 km (112 miles) from Iguala and arrived at the capital on Sunday. The 43 missing students abducted by corrupt police in southwest Mexico six weeks ago were apparently incinerated by drug gang henchmen and their remains tipped in a garbage dump and a river, the government said on Friday. REUTERS/Tomas Bravo (MEXICO - Tags: CIVIL UNREST CRIME LAW POLITICS SOCIETY)