Although authorities haven’t publicly identified any of the victims, Lydia Martinez Delgado said her niece was killed.
Delgado also gave a statement to CNN affiliate KSAT.
“I’m furious that these shooting continue, these children are innocent, rifles should not be easily available to all. This is … my hometown a small community of less than 20,000,” she told KSAT.
“I never imagined this would happen to especially to loved ones. … All we can do is pray hard for our country, state, schools and especially the families of all.”
According to Mireles’ profile on the Uvalde Consolidated Independent School District website, she had been an educator for 17 years.
In her off time, she enjoyed running, hiking, biking, and spending time with her family, according to the website.