US starts naval blockade of Iranian ports after deadline passes

Iran warns Americans they face higher pump prices due to prohibition imposed on Monday evening

Middle East crisis – live updates

The US blockade of ships using Iranian ports in the Gulf began on Monday evening, turning the six-week-old conflict between the US-Israeli coalition and Iran into a test of economic endurance.

US Central Command (Centcom) made no formal announcement of the start of the blockade but had said it would take effect at 5.30pm Iranian time (3pm UK time) on Monday, and would apply to any ships entering or departing Iranian ports or coastal areas, while ships using non-Iranian ports would not be impeded.