DUBAI, United Arab Emirates (AP) — European leaders are urging Iran to allow its citizens to demonstrate without reprisal after Tehran signaled security forces would crack down on the protesters. Activists said Friday that at least 62 people have been killed in the protests that began in late December over Iran’s ailing economy and have morphed into the most significant challenge to Tehran in years. Iran’s Supreme Leader Ayatollah Ali Khamenei has criticized President Donald Trump’s support for the protesters, saying Trump’s hands are “stained with the blood of Iranians.” The government has shut down the internet and is blocking international calls. State media has labeled the demonstrators as “terrorists” and more than 2,300 people have been detained.