The victims of the elementary school shooting

The victims of attack

A fourth-grade teacher was killed and a 10-year-old girl is missing and feared dead after a Texas elementary school massacre that killed 18 students and three adults.

Anabel Guadalupe Rodriguez's father says the 10-year-old is missing after the Robb Elementary School shooting.

The father told Fox News he submitted her photo to the Texas Rangers to identify her.

Eva Meirelles, 44, a fourth-grade special education teacher, was killed in the massacre.

Eighteen students and one teacher were killed.

A 44-year-old teacher has been named the first victim of an elementary school massacre in Texas, in which a frantic father shared a photo of his missing 10-year-old daughter.

The death of Eva Meirelles, a special education teacher at Robb Elementary School in Ovaldi, was confirmed to have died by her relatives Tuesday night.

She is married to Ruben Ruiz, 43, a policeman with the local police department, and they have parents to a college-aged daughter.

Meanwhile, 10-year-old Annabel Guadalupe Rodriguez is still missing, with her father sharing a photo of her in hopes of tracing her.

Her father, who has not been named, told Fox News he had not heard from her since gunman Salvador Ramos, 18, opened fire inside the school this afternoon.

The girl's father also gave her picture to the Texas Rangers, hoping they could track her down.

Eva Meirelles, 44, a fourth-grade special education teacher, was killed in a massacre at Robb Elementary School in Uvalde, Texas.

Meirelles has worked in the education system for 17 years and has been an associate teacher at the school for at least five of them.

Her Robb Elementary School profile describes herself as an active runner, hiker, and sometimes a cyclist. Her husband, Robin Ruiz, 43, is a police officer with the Ovaldi Unified Independent School District.

"I am outraged that these shootings continue," said Meirelles' aunt Lidia Martinez Delgado. These children are innocent. Guns should not be readily available to everyone. This is my hometown, a small community of less than 20,000. Her aunt, Lydia Martinez Delgado, said: 'I never thought this would happen particularly to our loved ones... All we can do is pray diligently for our country, state, schools, and especially everyone's families.'

 A mobile morgue was cut off outside the school earlier Tuesday as medical examiners began the grim task of identifying victims.

Ramos is shot and killed by a Customs and Border Patrol agent who realizes what was happening and runs to Robb Elementary School for help without needing support.

In addition, 13 children are being treated in the emergency room at Ewald Memorial and a 45-year-old man who developed "grazing."

Police said at a press conference on Tuesday evening that they would work to contact the victims of the deceased as soon as their remains were identified.

San Antonio Health University also confirmed that it had received a currently unknown baby and a 66-year-old woman in critical condition.

With 600 enrolled students, Robb Elementary School is located in Uvalde, Matthew McConaughey's hometown, 60 miles east of the Mexican border and 80 miles west of San Antonio.

Concerned parents were caught at the scene desperately searching for their children, and a video clip from the chaotic scene showed police arriving on the school campus with guns in hand.

One of the widely shared videos shows the suspected gunman approaching the school with what appears to be gunfire in the background.

Videos captured in the immediate aftermath of the shooting show mothers running frantically towards the school to collect their children.

Salvador Ramos, 18, shot his grandmother before he went to Robb Primary School in Ovalde; Clash with elements of the border guards nearby in an exchange of fire; Then he barricaded himself inside the school and killed 14 students and teachers.

The school warned parents to stay away and instead take their children from a meeting point after being "locked."

Ninety percent of the school's students are Hispanic. There are about 70 teachers.

This school is one of the many schools in the area located a stone's throw from the Mexican border, 220 miles from the city of Coahuila. The school is located on the outskirts of Ovaldi, with a population of 16,000.

Ted Cruz, the Republican senator from Texas, tweeted that he and his wife "are raising prayers for the children and families of the horrific shooting in Ovaldi."

Ken Paxton, the Texas attorney general, told Fox News that more teachers should take up arms.

"We can't stop bad guys from doing bad things," he said, adding that he "never understood that argument."