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More than a million customers in Puerto Rico remained without electricity on Thursday after a fire at a main power plant caused the biggest blackout so far this year across the United States territory, forcing it to cancel classes and shutter government offices.

The blackout also left nearly 170,000 customers without water, forced authorities to close some main roads, and snarled traffic elsewhere across the island of 3.2 million people, where the roar of generators and smell of diesel filled the air.

鈥淲e urge you to stay home if possible,鈥� said Puerto Rico Justice Secretary Domingo Emanuelli, who is serving as interim governor since Gov. Pedro Pierluisi is on an official trip in Spain.

Those who could not afford generators worried about how much longer they鈥檇 be without power. Owners of shuttered businesses also wondered when they could reopen.

Long lines formed at some gas stations as people sought fuel for generators. Others tried to charge their cellphones at businesses in scenes reminiscent of the aftermath of Hurricane Maria, which struck as a Category 4 storm in 2017.

Frustration and anger grew throughout the day as officials warned the outage could stretch into Friday.

鈥淣o one can say exactly when鈥� power would be fully restored, said Kevin Acevedo, a vice president of Luma, the company that took over transmission and distribution from Puerto Rico鈥檚 Electric Power Authority last year. 鈥淲e have to be realistic. The system is complex, delicate.鈥�

As of late Thursday afternoon, crews had restored power to some 500,000 customers out of nearly 1.5 million.

Officials in at least one city distributed food to hundreds of elderly people as well as ice to those whose medication must be kept cool.

鈥淭his is horrible,鈥� said Luisa Rosado, a mother of two who lives in the San Juan neighborhood of R铆o Piedras.

She said she and her husband had sacrificed their savings to install a solar electricity system at their home after Hurricane Maria, which gave them at least partial power following the blackout.

She said her neighbors had been outraged by recent increases in power bills, which were already higher than in most U.S. states.

鈥淭o increase bills when you don鈥檛 provide a perfect service ... the level of impunity is absurd,鈥� Ms. Rosado said.

Luma said the blackout could have been caused by a circuit-breaker failure at the Costa Sur generation plant 鈥� one of four main plants on the island. But company officials said the exact cause of the interruption is unknown.

鈥淚t鈥檚 going to require an exhaustive investigation,鈥� Mr. Acevedo said, adding that the equipment whose failure sparked the fire had been properly maintained.

Officials said at least three generation units were back online by Thursday, with crews working to restore more.

Luma CEO Wayne Stensby called it a 鈥渧ery unusual鈥� outage that 鈥渃learly indicates the fragility of the system.鈥�

The outage occurred two months before the Atlantic hurricane season starts, worrying many about the condition of Puerto Rico鈥檚 electrical grid.

鈥淵es, the system is fragile, no one is denying that, but we鈥檙e prepared,鈥� Mr. Acevedo said.

Police officers were stationed at main intersections to help direct traffic on Thursday while health officials checked in at hospitals to ensure generators were still running.

The outage further enraged Puerto Ricans already frustrated with an electricity system razed by Hurricane Maria in 2017. Emergency repairs were made at the time, but reconstruction efforts have not yet started, and power company officials blame aging, ill-maintained infrastructure for the ongoing outages.

The U.S. Federal Emergency Management Agency said late Thursday that it approved nearly $9.5B to Puerto Rico鈥檚 power company in September 2020 to rebuild the island鈥檚 electrical grid, but that it has yet to receive any transmission and distribution projects for evaluation and approval of construction funds.

A series of strong earthquakes that struck southern Puerto Rico where the Costa Sur plant is located also had damaged it.

The Electric Power Authority also is trying to restructure $9 billion worth of public debt to emerge from a lengthy bankruptcy. The company has struggled for decades with corruption, mismanagement, and a lack of maintenance.

In June last year, a large fire at a substation in the capital of San Juan left hundreds of thousands without power. Another fire at a power plant in September 2016 sparked an island-wide blackout.

This story was reported by The Associated Press.