MEXICO CITY (AP) — As painstaking attempts to reach survivors in quake-ravaged buildings across Mexico City stretched into a third day Thursday, desperation mounted among loved ones who earlier had high hopes for quick rescues and some complained they were being kept in the dark about search efforts. And what many had clung to as the unlikely triumph of life over death was revealed to be a case of some very high-profile misinformation: A top navy official announced there were no missing children at a collapsed Mexico City school where the purported plight of a girl trapped alive in the rubble had captivated people across the nation and abroad. President Enrique Pena Nieto's office raised the death toll from Tuesday's magnitude 7.