KATHMANDU, Nepal — Nepal’s prime minister resigned Tuesday as protests against a short-lived ban on social media grew increasingly violent and expanded into broader criticism of his government and accusations of corruption among the Himalayan country's political elite.

Demonstrations led by young people angry about the blocking of several social media sites gripped the country’s capital a day earlier, and police opened fired on the crowds, killing 19 people.

The ban was lifted Tuesday, but the protests continued , with demonstrators setting fire to the homes of some of Nepal’s top leaders and the parliament building. The airport in the capital of Katmandu was shut, and army helicopters ferried some ministers to safe places.

As the protests intensified, Prime Minister Khadga Prasad Oli s

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