Australia has raised its travel advice level for Nepal after deadly political unrest, but tourism operators say it may still be safe to visit the mountainous nation.

At least 19 people have been killed in anti-corruption protests in the capital Kathmandu. Demonstrators have stormed the nation's parliament and set the building on fire.

Nepal's prime minister has also resigned, with no clarity on who will replace him.

A key Nepalese diaspora group in Australia said the crisis stemmed from "years of poor governance, corruption and a lack of accountability".

"Watching from afar, there is a sense of grief and frustration, particularly as young lives have been lost in the struggle for justice and reform," Australia-Nepal Friendship Society president Niraj Gauli told AAP.

The organisation wi

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