At least 512 civilians had been killed in nearly two months of protests against the coup, 141 of them on Saturday, the bloodiest day of the unrest, according to the Assistance Association for Political Prisoners advocacy group.

Blinken told reporters the violence was “reprehensible” and followed a pattern of “increasingly disturbing and even horrifying violence” against demonstrators opposing military rule, including the killing of children as young as five.

The US has condemned the Feb 1 coup that ousted an elected government. Washington has imposed several rounds of sanctions, but Myanmar’s generals have refused to change course.

Blinken said other nations and companies worldwide should look at pulling “significant investments in enterprises that support the Myanmar military”.

“They should be looking at those investments and reconsidering them as a means of denying the military the financial support they need to sustain themselves against the will of the people,” he said.

The US last week placed Treasury sanctions on two military-owned conglomerates, which prevents US companies and individuals from dealing with them.

But some companies, including firms from US regional allies such as Japan and South Korea, still have business relationships with military-owned companies, according to activist groups.

Activists have also called on international energy companies like US-based Chevron to withhold revenues from natural gas projects they operate in Myanmar from the junta-controlled government.

One of Myanmar’s main ethnic minority rebel groups warned of a growing threat of major conflict on Tuesday and called for international intervention against the military crackdown.