Demonstrations roiled Venezuela’s capital Caracas on Saturday as a near total blackout continued in the country.

Supporters of opposition leader Juan Guaidó vented their anger over a major electricity outage and lack of other basics as Venezuelans backing President Nicolás Maduro held a rival demonstration.

“This is chaos,” said Jorge Jaimes, a physician who joined opposition protesters on Avenida Victoria. “We are at the end of this road.”

Since the outage started Thursday, at least 13 people have died in hospitals without electricity, according to reports.

Tensions remain high as Maduro keeps struggling to assert his authority in the face of calls by Guaidó and many foreign leaders for new balloting.

Addressing protesters, Guaidó, who declared himself interim president in January, promised to embark on a tour of the country before leading a nationwide march on the capital.

“All the options are on the table,” he said, using a phrase employed by President Trump, who has refused to rule out a military intervention in Venezuela.

Guaidó was speaking from the back of a pick-up truck after security services prevented the opposition from setting up a stage at their original protest site. Three people were arrested.

Communication with the interior of the country was largely shut off by the outage. Sporadic power failures are common in Venezuela, but the latest one has been far more widespread than usual.

Maduro claimed the outage was caused by US sabotage of the national electrical system and accused Guaidó of collaborating. Local news outlets said regional authorities attributed the failures to problems at the country’s main power plants.

Maduro stepped up verbal attacks on Guaidó, calling him “a clown and puppet” in a speech to supporters outside Miraflores, the presidential palace.

The US and about 50 other countries have voiced support for Guaidó’s campaign to oust Maduro and hold new elections. But the ruler has retained the support of the military and allies including Russia and China.

Guaidó—who has the support of around 60 percent of Venezuelans, according to a recent poll—and the United States have tried a variety of approaches to lure the military away from Maduro.

They range from private talks to a proposed Venezuelan amnesty law that would shield officers from future prosecution.