MEXICO CITY — On the first day of trial, a witness named Bernardo Bernal recounted how, as a 9-year-old in the spring of 1983, he hid in a stream and watched Guatemalan soldiers kill his parents and two younger brothers.

On the second day of testimony in Guatemala City, a man named Pedro Chavez Brito described how soldiers found him and his siblings hiding in a traditional sauna in their village on Nov. 4, 1982. His sister was carrying a newborn.

” ‘You are a guerrilla, you gave food to the guerrillas,’ they said to my sister,” the witness said, according to an unofficial transcript of the genocide case in Guatemala. Soldiers tied his sister to the stairs of the house and set fire to it, killing her, her children and perhaps six other relatives, Chavez Brito testified.

Another witness said soldiers used an old woman’s severed head as a soccer ball.

The litany of terrors recalled in the genocide trial of former Guatemalan President Gen. Efrain Rios Montt has been relentless. The proceedings have been widely hailed by human rights groups as an important reckoning with the past, a rare prosecution of a former Latin American military dictator for war crimes in his own country.

But on Thursday, nearly a month into the trial, the case suffered a potentially devastating setback. In a stunning turn, a judge from a different court granted an appeal from Rios Montt’s defense to annul the entire case based on a technicality. That ruling in effect shut down the genocide trial and may force it to start all over. Prosecutors said they would appeal the decision.

“This is an absolute abuse of power, it is illegal, and of course we are going to appeal,” Arturo Aguilar, an aide to the attorney general, said shortly after the ruling.

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