Tehran issues warning after Donald Trump says US stands ready to help amid crackdown on demonstrations

Iran has warned the US not to attack over protests that have rocked the country, as Donald Trump weighed the options for a response from Washington, with the reported death toll from the demonstrations soaring to the hundreds.

At least 538 people have been killed in the violence surrounding demonstrations, according to the US-based Human Rights Activists News Agency (HRNA), including 490 protesters. The group reported that more than 10,600 people were arrested by Iranian authorities.