Tensions flared Saturday as desperation grew in Venezuela's state of La Guaira as rescuers and civilians searched for earthquake survivors and the death toll rose sharply to 1,430. Families reported at least 68,900 people missing Saturday, three days after the one-two punch of 7.2 and 7.5 magnitude earthquakes devastated the South American nation. Venezuelans looking for loved ones and neighbors used shovels, heavy equipment, ropes and bare hands atop mounds of toppled concrete throughout La Guaira, one of the hardest-hit states. They were joined by a growing number of international rescue teams who began to climb through the rubble, offering a small glint of hope to anguished families. Tensions peaked over what many Venezuelans viewed as an inadequate response by the government, whose soldiers, firefighters, police and military cadets were evidently underprepared to respond to the scope of the tragedy. Frustration was amplified by efforts to project the image of a robust state response. Aid agencies consider the first 48 to 72 hours as crucial for retrieving people alive, though that can be extended if they have access to food and water. Venezuelan officials said 17 flights carrying more than 1,600 rescue team members had touched down by Saturday. As 72 hours passed since the earthquakes struck, many felt every minute ticking away as they ran out of time to rescue people alive.