The head of Iran's judiciary signaled Wednesday there would be fast trials and executions ahead for those detained in nationwide protests despite a warning from U.S. President Donald Trump.

The comments from Iran's judiciary chief Gholamhossein Mohseni-Ejei come as activists had warned hangings of those detained could come soon. Already, a bloody security force crackdown on the demonstrations has killed at least 2,571, the U.S.-based Human Rights Activists News Agency reported. That figure dwarfs the death toll from any other round of protest or unrest in Iran in decades and recalls the chaos surrounding the country's 1979 Islamic Revolution.

U.S. President Donald Trump on Tuesday said Iranians should continue nationwide protests and take over the country's institutions as authorities there cracked down on mass demonstrations.

"Iranian Patriots, KEEP PROTESTING - TAKE OVER YOUR INSTITUTIONS!!!" Trump wrote on his Truth Social platform.

Greenland's prime minister said Tuesday that the autonomous territory would choose to remain Danish rather than become part of the United States, following U.S. President Donald Trump's threats to take over the Arctic island.

"We are now facing a geopolitical crisis, and if we have to choose between the United States and Denmark here and now, we choose Denmark," Greenlandic Prime Minister Jens-Frederik Nielsen told a press conference in Copenhagen.

Iranians have found themselves without email, texts and foreign apps for days, with even landline phone calls unreliable under a digital blackout imposed by authorities in the face of widespread protests.

France's Foreign Minister Jean-Noel Barrot said Tuesday he had summoned the Iranian ambassador to object to what he described as "state violence unquestioningly unleashed on peaceful protesters" in Iran.

U.S. President Donald Trump announced a 25-percent tariff on any country doing business with Iran, ramping up pressure as a rights group estimated a crackdown on protests has killed at least 648 people.

Iran's parliament speaker on Monday described the response to a protest wave that has gripped the Islamic republic as a "war against terrorists", as he addressed a vast pro-government rally in Tehran.

The EU said Monday conditions were not yet ripe to talk to Russia's Vladimir Putin over the war in Ukraine, after the leaders of France and Italy said it was time Europe re-engaged.

Cuba's leader said Monday there were "no conversations" with the United States, after President Donald Trump urged the communist-ruled island to "make a deal" or pay the price.

Iran is fully prepared for conflict but also ready for negotiations, its foreign minister said on Monday, as U.S. President Donald Trump said the Iranian leadership was seeking talks after he threatened to intervene militarily over a crackdown on protests.