LA GUAIRA, Venezuela (AP) — With the window for finding survivors shrinking fast, Venezuelans combed Monday through more ruins of buildings toppled by last week’s devastating back-to-back earthquakes, and a 4.6 magnitude aftershock rumbled through the disaster zone in the northern state of La Guaira.

Five days have passed since the twin earthquakes struck northern Venezuela, killing more than 1,450 people, according to the government. Relief organizations say the first 72 hours after a natural disaster is the most crucial time period for rescues, though survival can be extended if people have access to food and water.

The Associated Press