Iran war: Trump says Tehran cannot 'blackmail us'

US President Donald Trump on Saturday warned Iran not to "blackmail" Washington by shutting the Strait of Hormuz once again.

"We're talking to them. They wanted to close up the strait again — you know, as they've been doing for years — and they can't blackmail us," Trump said at a White House event.

His statement came after Tehran had earlier announced the closure of the strategic waterway — which connects the Persian Gulf to world markets and is key to global energy security — saying that the US' continued blockade of Iranian ports and shipping violates the terms of the truce agreement reached by the warring parties.

Second vessel attacked near Strait of Hormuz, UKMTO says

The UK Maritime Trade Operations reported on the second attack on a vessel near the Strait of Hormuz on Saturday, hours after Iran announced it was closing the strategic waterway yet again.

UKMTO said an unknown projectile hit the container vessel 25 nautical miles (46 kilometers) northeast of Oman, damaging some of its containers.

Earlier on Saturday, UKMTO reported that two gunboats from Iran's Revolutionary Guard opened fire on a tanker transiting the strait.