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The operation led to an hours-long standoff between demonstrators and federal agents, who used less lethal ammunition to keep the crowd at bay.

The process of salt collection in San Francisco Bay was industrialised in the 1800s but now the bay's salt ponds are part of a major restoration project, bringing back tidal marshes and wildlife.

Number eight Liana Mikaele-Tu'u, who was also outstanding, powered over to bring up the champions' third try but they then needed to defend well to keep the Spanish side at bay.

Smoke plumes were seen spread across the east bay as flames scorched up dry grass.

The system’s length and strength will be compounded by some offshore winds, which will help keep any marine influence at bay and keep temperatures high, even overnight.