The search has intensified for tens of thousands reported missing in Venezuela as the death toll from two major earthquakes surpassed 900.Venezuela's government said on Friday that 172 people remained trapped, 920 were dead, and more than 3,000 were injured after two magnitude 7.2 and 7.5 quakes hit within a minute of one another and devastated parts of the country's north on Wednesday evening, local time.More than 50,000 people have been reported missing.Witnesses reported hearing cries from people trapped alive under concrete and metal.The event triggered an outpouring of support from nations across the world, but nearly two days later, foreign rescue teams and aid had just begun to reach hard-hit areas The quakes struck a nation already weakened by decades of economic and political turmoil that has impoverished residents, driven millions abroad and weakened infrastructure.The 7.5-magnitude earthquake was Venezuela's most powerful since 29 October, 1900, when a 7.7-magnitude tremor struck offshore.A United States geological survey estimated more than 10,000 deaths were possible, which would make the event one of Latin America's deadliest earthquakes of the last century.UN chief Antonio Guterres said he was "deeply saddened" by the disaster as the global body vowed to assist Venezuela.The strongest quake to hit Venezuela in 126 years will require "massive collective efforts," UN aid chief Tom Fletcher said in a statement.The International Medical Corps (IMC), which was providing support on the ground, said the hospitals which had survived the quake were overwhelmed with mass casualties, adding that the long-term effects of the earthquakes were likely to be severe