Buildings are completely dark during a total blackout after Hurricane Maria made landfall Sept. 20, 2017 in San Juan, Puerto Rico. Thousands of people have sought refuge in shelters, and electricity and phone lines have been severely affected.

Hurricane Maria tore up Puerto Rico early Sept. 20 as a Category 4 storm with winds of 155 mph. At least 16 people were killed, and nearly all 3.4 million people on the island were left without power and most without water.

Maria was the strongest hurricane to hit Puerto Rico in nearly 100 years. There still is no exact tally of the cost and full extent of the damage, but Gov. Ricardo Rossello says it will bring a complete halt to the economy for at least a month.