Brazilian police investigate 3 persons in attack on presidential candidate
Xinhua
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Supporters of Presidential candidate Jair Bolsonaro are seen in front of the Albert Einstein hospital after he was stabbed by a man in Juiz de Fora, in Sao Paulo, Brazil September 7, 2018. (Photo: VCG)

RIO DE JANEIRO, Sept. 7 (Xinhua) -- Brazilian police are investigating three people for their alleged ties to the attack on presidential candidate Jair Bolsonaro though evidence indicates the attacker acted alone, authorities said Friday.

Minister of Public Security Raul Jungmann told reporters that police are treating the attack as an isolated case, saying that the attacker was a "lone wolf," however they were investigating two others.

"According to the information we have up till the moment, the act is concentrated on the one who committed the attack. There are others who could be implicated, but until the moment there is no evidence or proof, although they remain as suspects and continue to be investigated," he said.

Jungmann said the police are working with intelligence department to reconstruct the attacker's steps as well as those around him.

The suspect, Adelio Obispo de Oliveira, 40, was arrested immediately after the attack and will remain jailed until his first court appearance.

He was charged with personal attack for political nonconformism. If convicted he could serve three to 10 years in prison.

Brazilian law stipulates that if the attack results in grave injury, the sentence could be doubled.

Bolsonaro underwent emergency surgery at a hospital in Juiz de Fora in the state of Minas Gerais. On Friday morning, he was transferred to a hospital in Sao Paulo where he is expected to remain a week to 10 days in recovery.