A fire has destroyed up to 300,000 tonnes of sugar at several warehouses in the southern Brazilian port of Santos before it was contained, authorities say.
Four people were injured in the blaze, which erupted in warehouses owned by Copersucar, the world's largest sugar trader, the Port of Santos said in a statement.
"It has been brought under control," a spokesman said.
Santos port officials said the fire broke out in the conveyor belt system that links Copersucar's six warehouses, which have a capacity to hold up to 100,000 tonnes of sugar each.
All six warehouses were damaged by the blaze and all Copersucar operations were at a standstill, port officials said, adding that it was too early to assess the extent of the damage.
After the fire was reported, sugar prices in the $US17.5 billion ($A18.21 billion) futures market spiked 6 per cent and traded near one-year highs.
Sugar futures later pared gains and were recently up 2.5 per cent at 19.47 US cents a pound on ICE Futures US.
"The loss of the warehouse space in ports will make shipping much more difficult. So we saw a short-term spike in prices, but as the logistical issues get worked out, we will see this go away," US-based Price Futures Group senior analyst Jack Scoville.
"It will hurt world availability for the short term, though, and probably help India and Thailand sell sugar at slightly better prices than they might have been able to do otherwise."
Santos, Brazil's biggest port, accounts for more than 60 per cent of the country's sugar exports and Copersucar is responsible for 25 per cent of the sugar shipped through Santos.
From January to August, nearly 12.8 million of sugar transited through Santos, officials said.
Brazil is the world's leading producer of sugar and ethanol.
The sugarcane sector directly employs 1.2 million people out of a total population of more than 200 million.
The UNICA sugarcane and ethanol lobbying group, which represents 60 per cent of the country's sugarcane producers and processors, forecast record sugarcane production in 2013-14, with an ever-growing share going to ethanol output.
It said the harvest in the main producing region in central-southern Brazil should total 587 million tonnes, up 10.18 per cent from the previous one.
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