Protests had began Monday in the Nepali capital against the government's ban on social media and over corruption, but escalated into an outpouring of rage nationwide with government buildings set on fire after a deadly crackdown claimed at least 19 lives.

The rapid descent into chaos shocked many, and Nepal's military warned against "activities that could lead the country into unrest and instability" in the country of 30 million people.

Smoldering plumes of smoke rose from the government buildings, residences of politicians, supermarkets and other buildings targeted by protesters, an AFP reporter said Wednesday.

Streets were littered with carcasses of burnt vehicles and tires.

"It is quiet today, the army is on the streets in all places", one soldier inspecting cars at a makeshift street checkpoint said, who could not be named as he was not authorized to speak to reporters.

Gangs on Tuesday had attacked and set fire to the house of KP Sharma Oli, the 73-year-old, four-time prime minister and leader of the Communist Party.

He later quit to allow "steps towards a political solution". His whereabouts are not known. 

Nepali Army chief, General Ashok Raj Sigdel, has appealed for talks, in a video message issued late Tuesday. 

"To provide the nation with a peaceful resolution, we urge all groups involved in the protest to call it off and engage in dialogue", he said.

The International Crisis Group called it a "major inflection point in the country's uneasy experience with democratic rule".

United Nations Secretary-General Antonio Guterres has urged "restraint to avoid a further escalation of violence", his spokesman Stephane Dujarric said in a statement.

Prime Minister Narendra Modi of neighboring India said that the "stability, peace and prosperity of Nepal are of utmost importance to us".

What happens next is unclear.

"The protesters, leaders who are trusted by them and the army should come together to pave the way for a caretaker government," constitutional lawyer Dipendra Jha told AFP. 

Crisis Group analyst Ashish Pradhan echoed that, saying a "transitional arrangement will now need to be charted out swiftly and include figures who still retain credibility with Nepalis, especially the country's youth".

People aged 15-40 make up nearly 43 percent of the population, according to government statistics -- while unemployment hovers around 10 percent and GDP per capita is just $1,447, according to the World Bank.

Several social media sites -- including Facebook, YouTube and X -- were blocked on Friday, after the government cut access to 26 unregistered platforms. 

Since then, videos contrasting the struggles of ordinary Nepalis with the children of politicians flaunting luxury goods and expensive vacations have gone viral on TikTok, which was not blocked.