Brazilian far-right congressman Jair Bolsonaro was stabbed in the abdomen during a campaign event Thursday.
The incident happened during a rally in the city of Juiz de Fora, in the state of Minas Gerais.
It is noted that doctors have operated on a policy - he received unsafe internal injuries.
The doctor said the two-hour procedure stopped serious internal bleeding and repaired most of the damage from the knifing. According to the forecasts of physicians, to recover from the knife attack, he will be at least a couple of months.
Military police have arrested a suspect who had to be rescued after angry crowds tried to lynch him - he has been identified as Adélio Bispo de Oliveira. Bolsonaro is well ahead of other presidential hopefuls in the opinion polls.
Image copyright ReutersImage caption Stabbing suspect Adelio Obispo de Oliveira was grabbed by members of the crowd Image copyright EPAImage caption It took the crowd some moments to realise Jair Bolsonaro, top right, had been stabbed What has been the reaction?
President Michel Temer quickly condemned the attack and instructed his minister of security to reinforce security for election candidates.
Bolsonaro is one of the most controversial candidates in the current electoral round because he is a defender of Brazil's 1964-1984 military dictatorship.
Gomez, Shaw start for England as De Gea keeps his place
Sergio Ramos has already 2 goals for Julen Lopetegui's side so far in the league as he converted two penalties he received. He might be glad that Madrid didn't get drawn against Liverpool in the Champions League , though.
Florence projected to strengthen to major hurricane
The WFMY News 2 Weather team predicts it may get uncomfortably close to the East Coast by the middle of next week. On the forecast track, Helene will pass very close to the southern Cabo Verde Islands tonight and early Sunday.
British Airways travelers' credit card details hacked
Shares in BA's parent, International Airlines Group ICAG.L , fell 3 percent in early deals on Friday. British Airways revealed the hack Thursday evening and began notifying customers.
Bolsonaro has sparked outrage among many in Brazil for his racist and homophobic comments on the campaign trail. Analysts said Thursday's attack may potentially give his candidacy a fresh momentum.
The only Brazilian politician now more popular is the leftist ex-president Luiz Inacio Lula da Silva, who is in prison for corruption and has been banned from competing in October's election.
The former army captain has made a name for himself with his unapologetic rejection of political correctness and willingness to court controversy.
A hospital spokeswoman confirmed to Reuters news agency that Bolsonaro was undergoing surgery, but did not provide further details.
Earlier, one of the candidate's sons, Flavio Bolsonaro, had announced on Twitter that his father's wounds were "superficial", but he later wrote: "Unfortunately, it's more serious than we thought".
A statement from federal police said the candidate had body guards. Reuters quotes officials as saying the suspect is mentally disturbed.
Bolsonaro who has been described as Brazil's Donald Trump has quite a social media following with 8.5 million people. "'I think the left shot itself in the foot because with this attack they will end up electing Bolsonaro'". In March, while da Silva was on a campaign tour in southern Brazil before his imprisonment, gunshots hit buses in his caravan.