Story highlights Police revise up the amount of acid on board to over 800,000 liters

At least one freight car has probably ruptured and leaked, police say

The exclusion zone around the crash site is set to stay in place for days

(CNN) The train that derailed in northern Australia over the weekend was carrying more than four times as much sulfuric acid as previously announced, police said Tuesday.

The freight train had roughly 819,000 liters (216,000 gallons) of the highly corrosive acid on board when it came off the tracks Sunday morning in a remote area of northern Queensland, state police said. They had initially said about 200,000 liters of acid was on board.

Officials believe that at least one of the freight cars has probably ruptured, which means as much as 31,500 liters of acid could have leaked out, according to a police statement

Exclusion zone set up around site

Authorities have declared an emergency and set up a 2-kilometer (1.2-mile) exclusion zone around the crash site. The exclusion zone is expected to remain in place until at least Thursday.

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