Jan. 5 (UPI) -- At least 19 protesters in Iran have been killed over the last eight days of unrest, including three teens.

Protests and strikes in Iran began on Dec. 28 against the falling currency rate and inflation.

President Donald Trump has warned that the United States will intervene if more protesters were killed.

"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," Trump told reporters on Air Force One.

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