The next global food crisis is unfolding in a narrow stretch of water.

The United Nations warns that if fertilisers cannot pass through the Strait of Hormuz within just a few weeks, the world could face mass starvation.

It says the consequences could be severe if shipping disruptions linked to the Iran conflict drag on.

Food prices are already at a three-year high, while fertiliser costs critical for agriculture have rocketed.

Aid agencies fear a prolonged disruption could push tens of millions more people into hunger.

For vulnerable economies already struggling with debt and high import costs, the risks are growing fast.