President Donald Trump says the US military is considering "very strong options" in Iran, as anti-government protests which have reportedly killed hundreds enter a third week. The US-based Human Rights Activist News Agency (HRANA) says it has verified the deaths of nearly 500 protesters and 48 security personnel in Iran, while sources tell the BBC the death toll could be much higher. Trump has threatened to intervene, and said on Sunday that Iranian officials had called him "to negotiate" - but added "we may have to act before a meeting". Iranian leaders have described the demonstrators as a "bunch of vandals", and called on their supporters to take part in pro-government marches on Monday.