The critical 72-hour window for finding survivors of the powerful twin earthquakes that struck Venezuela had closed by Monday, leaving international teams facing a grim race against time to pull anyone else alive from the debris. The death toll has surpassed 1,450 and nearly 200 buildings have completely collapsed. On Sunday, a man and his teenage son were found alive under the rubble by French and American rescue teams in Caraballeda, a town about 40 km north of Caracas.