BBC:

David Gritten

A wave of protests sparked by Iran's failing economy has entered its ninth day, as President Donald Trump renewed his threat of US intervention.

On Sunday, videos published online showed demonstrations in Tehran, as well as Fars, Ilam, North Khorasan and Semnan provinces.

Human rights activists said protests had taken place in 26 of the country's 31 provinces since last week, and that at least 19 protesters and one member of the security forces had been killed.

Trump warned overnight that Iranian authorities would be "hit very hard" if more protesters died.

"We're watching it very closely. If they start killing people like they have in the past, I think they're going to get hit very hard by the United States," he told reporters on Air Force One.

On Monday morning, the speaker of Iran's parliament said the protesters' "legitimate demands" should be heard and used as the basis for change.

But Mohammad Baqer Qalibaf added that any foreign agents and opponents of the establishment attempting to exploit the protests would be "confronted effectively".

His comments echoed those of Iran's Supreme Leader, Ayatollah Ali Khamenei, who has declared that "rioters should be put in their place".

The Iranian foreign ministry's spokesman also accused Israel of seeking to "undermine our national unity", after Prime Minister Benjamin Netanyahu expressed his government's "solidarity with the struggle of the Iranian people" on Sunday.

Esmail Baqai told a news conference that the statements by Netanyahu and "certain radical American officials" were "nothing more than incitement to violence".

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