SAN CRISTÓBAL, Venezuela — At least 11 people have died in more than two weeks of antigovernment protests, according to government and news media reports, and there are no signs of anything calming down. But even the death toll was a cause for argument on Sunday in this bitterly divided country, as officials disagreed over whether the latest death was related to the protests.

President Nicolás Maduro said during a television broadcast on Sunday that the latest victim was a young man who was stabbed to death the previous night near this city in western Táchira State, which borders Colombia. The protests started here in early February before sweeping the nation. Last week, Mr. Maduro ordered hundreds of soldiers into the state to restore order, leading to further tension with demonstrators.

Mr. Maduro, speaking in Caracas, the capital, said the victim of Saturday’s stabbing, Danny Vargas, was not a protester but was mistaken for one by the man who killed him. The attacker, he said, had been humiliated by demonstrators in an earlier incident and stabbed Mr. Vargas when he passed by a barricade the protesters had built to block a street.

“Two victims,” Mr. Maduro said. “A humiliated man, a victim of rage, and a boy, a victim of the aggression of the protesters, and then a situation of uncontrolled violence, thanks to who? Thanks to the protesters, thanks to the coup plotters.”