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Satellite images show deforestation increased from 103 sq km in March and April 2010 to 593 sq km (229 sq miles) in the same period of 2011, Brazil’s space research institute says.

Much of the destruction has been in Mato Grosso state, the centre of soya farming in Brazil.

The news comes shortly before a vote on new forest protection rules.

Brazilian Environment Minister Izabella Teixeira said the figures were “alarming” and announced the setting up of a “crisis cabinet” in response to the news.

“Our objective is to reduce deforestation by July,” the minister told a news conference.

Analysts say the new figures have taken the government by surprise.

Last December, a government report said deforestation in the Brazilian Amazon had fallen to its lowest rate for 22 years.

However, the latest data shows a 27% jump in deforestation from August 2010 to April 2011.