Repair crews worked through the night trying to restore electricity to Puerto Rico's 3.5 million people early Thursday after a fire at a power plant blacked out the entire U.S. territory.
Officials said they hoped to restore service by morning, but some schools canceled classes for the day as a precaution. The island's largest public hospital canceled elective surgeries and non-urgent appointments, while government officials and private groups put off dozens of scheduled events.
The island's governor said there was no reason to believe that any sort of sabotage caused the blackout.
About 130,000 customers had power restored as of early Thursday morning. (For more breaking details (in Spanish) from Telemundo 47, click here.)
The Electric Power Authority said investigators were trying to determine what caused the fire that broke out Wednesday afternoon at a power plant in southern Puerto Rico that serves a majority of customers on the island. The fire began at a switch and caused two transmission lines of 230,000 volts each to fail.
"This is a very serious event," Gov. Alejandro Garcia Padilla said. "The system is not designed to withstand a failure of this magnitude."
The outage was the latest hit for an island mired in a decade-long economic crisis and whose government has warned it is running out of money as it seeks to restructure nearly $70 billion in public debt.
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Many Puerto Ricans expressed doubts that power would be restored quickly, saying the economic slump has affected basic government services. Hundreds of people took to social media to criticize the Electric Power Authority, noting that they already pay bills on average twice that of the U.S. mainland.
It was unclear how much damage the fire caused or where the power company would obtain the money to repair or buy new equipment. The utility is struggling with a $9 billion debt that it hopes to restructure as it faces numerous corruption allegations. Company officials have said they are seeking more revenue to update what they say is outdated equipment.
Authorities said Wednesday's outage caused 15 fires across Puerto Rico as a result of malfunctioning generators, including at the upscale Vanderbilt hotel in the popular tourist area of Condado and at the mayor's office in the northern coastal town of Catano. All those fires were extinguished and no one was injured, officials said.
