Kathmandu, Nov. 20 -- Security forces in Nepal used disproportionate force against youth-led protests on September 8, Human Rights Watch said on Thursday.

The interim government led by former chief justice Sushila Karki should investigate excessive force, arson, and mob attacks, including those who may have ordered unlawful acts, the human rights watchdog said.

Human Rights Watch in a statement issued from its headquarters based in New York said it found that police indiscriminately fired on protesters multiple times over three hours, killing 17 people in Kathmandu on September 8.

This sparked a second day of violence on September 9, but security forces appeared to fail to act when groups of people, some apparently not linked to the Ge...