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Bolsonaro was stabbed while in the city of Juiz de Fora in Minas Gerai state today.

Brazilian media has reported the far-right candidate suffered a serious liver injury in the attack.

His son Flavio Bolsonaro said on Twitter his father's condition is "more serious that we had hoped for".

He wrote: "The perforation reached part of his liver, lung and intestine.

"He lost a lot of blood, arrived at the hospital... almost dead. He appears to have stabilized now. Please pray!"

A hospital spokeswoman confirmed the 63-year-old has undergone surgery.

A Tweet posted on Bolsonaro's official account said he was now "doing well and recuperating".

They added he was at risk of dying when he arrived at the hospital but was now in a "grave but stable" condition.