The UK government has summoned the Iranian ambassador in response to the ongoing "brutal" killings of protesters in the country, the foreign secretary has said.
Thousands of people are feared dead or have been detained after a crackdown on anti-government protesters across Iran in recent days.
Foreign Secretary Yvette Cooper outlined "the UK's total abhorrence of the killings, the violence, and the repression that we are seeing", and said she feared the death toll may be significantly higher than reported so far.
She also said the government would implement "full and further sanctions" against Iran targeting finance, energy, transport, software and other significant industries.
The Foreign Office has not specifically set out what form the new sanctions will take or when they will be put in place.
