What to know about the Uvalde school shooting trial as it heads into its second week

The trial of a Texas police officer charged in the halting law enforcement response to the attack on Robb Elementary heads into a second week Monday with prosecutors continuing to press their case that he did nothing in the early moments to stop the gunman.

Adrian Gonzales, 52, a former Uvalde schools police officer, was among the first officers to arrive on the scene as the gunman approached the school. Gonzales has pleaded not guilty to 29 counts of child abandonment or endangerment.

The May 24, 2022, attack is one of the worst school shootings in U.S. history. It left 19 students and two teachers dead.

The opening days of the trial included dramatic replays of the initial emergency calls, testimony from teachers who huddled with terrified students, and the mother of one of the victims recounting how her daughter had asked to leave school early that day.

The trial's second week could include testimony from experts in police training and more families of the victims. It was unclear if Gonzales planned to testify in his own defense.

Trial focused on a single officer, not the larger police response

Gonzales was among the first of more than 370 federal, state and local officers to arrive at the school. It would take more than an hour for a tactical team to go into a classroom and kill 18-year-old gunman Salvador Ramos.

Prosecutors noted how students made 911 calls from inside the classroom with the gunman.

''When a child calls 911, we have a right to expect a response,'' special prosecutor Bill Turner said in opening statements.

Gonzales' attorneys said he never saw the gunman outside the school. They also said Gonzales helped students evacuate from other classrooms and noted how the gunman was able to quickly get inside through an unlocked door.

A mother, teachers and photos recount the terror of the day

Jennifer Garcia told jurors her 9-year-old daughter Eliahna Garcia asked to leave school early after an awards program. But the family had already given her teacher a little bit of money to pitch in for a class pizza and movie party.

The family was among the last to learn that night that their daughter had died.

Several Robb teachers and a staff member described the terror of seeing the gunman approach and hearing the booming staccato of gunfire. They described following their training for active shooter situations: locking classroom doors, turning out the lights and keeping the children quiet.

''I told them I loved them,'' said teacher Lynn Deming, who was wounded by shrapnel when a classroom window was shot out. ''I wanted to tell them it would be OK, but I wasn't sure. I wanted to make sure the last thing they heard was that somebody loved them.''

Jurors also saw photos from the classrooms that showed large amounts of blood and the dead gunman. A medical examiner described the wounds to the children, noting several were shot at least a dozen times.

Tracing a trail of bullets outside the school

Prosecutors had a setback when the testimony of the first teacher to testify was dismissed by the judge. She described running with children from the playground, seeing a gunman dressed in black with a rifle, and puffs of smoke in the dirt from bullets as he fired.

Defense lawyers complained her detailed description of the gunman — which would help place him near Gonzales — was new evidence that was not disclosed before trial. Judge Sid Harle denied their request for a mistrial but instructed the jury to disregard her testimony.

Rare prosecution of a police officer

The trial is a rare case in which a police officer could be convicted of allegedly failing to act to stop a crime and protect lives.

Gonzales and former Uvalde schools Police Chief Pete Arredondo are the only two responding officers that day to face charges. Arredondo's trial has not yet been set.