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 7.1 earthquake to 273, including 137 in the capital. In a statement, it said there were also 73 deaths in Morelos state, 43 in Puebla, 13 in the State of Mexico, six in Guerrero and one in Oaxaca. More than 2,000 were injured and more than 50 people rescued in Mexico City alone, including two women and a man pulled alive from the wreckage of a building in the city's center Wednesday night. Still, frustration was growing as the rescue effort stretched into Day 3. Outside a collapsed office building in the trendy Roma Norte district, a list of those rescued was strung between two trees. Relatives of the missing compared it against their own list of those who were in the building when the quake struck -- more than two dozen names -- kept in a spiral notebook. Patricia Fernandez's 27-year-old nephew, Ivan Colin Fernandez, worked as an accountant in the seven-story building, which pancaked to the ground taking part of the building next door with it. She said the last time the family got an update was late yesterday, when officials said about 14 people were believed to be alive inside. Three people have been rescued from the building since the quake. "They should keep us informed," Fernandez said as her sister, the man's mother, wept into her black fleece sweater. "Because I think what kills us most is the desperation of not knowing anything." Referring to rumors that authorities intend to bring in heavy machinery that could risk bringing buildings down on anyone still alive inside, Fernandez said: "That seems unjust to us because there are still people alive inside and that's not OK." Since early Wednesday, the eyes of the nation had been focused on the Enrique Rebsaman school in southern Mexico City, where rescuers told reporters a girl, identified only as Frida Sofia, had signaled she was alive deep in the rubble by wiggling her fingers in response to rescuers' shouts. Numerous rescuers at the school site spoke of the girl, with some saying she had reported several other children alive in the same space, and the child became a symbol of hope amid a disaster that has shocked the country. But with TV cameras and journalists kept a block away from the precarious site, the only images broadcast live around-the-clock of the purported rescue showed long-distance shots of rescuers digging and no images of a child. As the rescue effort continued into Thursday, no family members came forward to identify the girl, and some officials had begun to say the identity of the person trapped in the rubble was not clear.