US president Donald Trump warns Iran "our patience is wearing thin", and then posts: "UNCONDITIONAL SURRENDER!"
But the US president says "we" are not going to kill Iran's Supreme Leader Ayatollah Ali Khamenei - "at least not for no," BBC reported.
Trump is considering joining Israel's strikes targeting Iran's underground nuclear sites.
The US says it is not involved with Israel's air strikes for now - whether it eventually joins in is the 30,000lb question, writes our correspondent Frank Gardner.
In a show of defiance, Khamenei says Iran will never compromise with Israel, and "we will show the Zionists no mercy."
Europe is divided, with France warning against a push for regime change while Germany grateful for Israel doing the "dirty work".
Five days since Israel began attacking Iran, both sides continue to fire at each other, but it's not easy for Iranians to evacuate.
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