Commenting on the incident, Oliveira, who was born and raised in the town of Tres Rios, said that he went to purchase gasoline for his mother's car on Monday night, but saw a brawl involving his family.
According to the welterweight, a guy approached them and started pointing a gun at his nephew's face. After that, "people started pushing each other," he added.
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"They threw a grenade in my direction. Fragments flew to my leg and my foot," Oliveira noted.
Furthermore, the UFC fighter said that the attackers were armed with machetes, knives, and a grenade.
Following the incident, the Oliveira underwent minor surgery at a local hospital on Christmas Day where medics removed fragments from his leg.