Parents waited late into the night for children to be identified after a gunman killed 19 students and 2 adults at a Texas elementary school

(CNN) Just two days before students in a Texas elementary school were set to begin their summer break, a gunman clad in body armor rushed his way into the school and opened fire on classrooms of young children , killing 19 students and two adults, officials said.

The violent act shook a nation already reeling from another mass shooting across the country just 10 days ago. Parents waited late into the night at a nearby civic center to learn whether their children had survived, with some telling CNN they had to give DNA samples to assist authorities in identifying children.