They were, by some measures, the lucky ones.

The children who were rushed to the hospital, bloody and scared. The ones who clutched their parents in emotional reunions that circulated on the news.

They were the latest survivors of the latest school shooting, which killed two children, ages 8 and 10, in Minneapolis on Wednesday.

Now the children of Annunciation Catholic School join a group that numbers nearly 400,000: America’s children who have been exposed to gun violence at school.

As Natalie Barden, the sister of 7-year-old Daniel Barden, who was killed at Sandy Hook Elementary School in Newtown, Conn., in 2012, put it in a letter to future survivors of school shootings: “You are now part of this sad little club that is actually not so little anymore.”

More than 397,000 children have experienced gun violence at school since the shooting at Columbine High School in Littleton, Colo., in 1999, according to data collected by The Washington Post. That number now includes the students who hid under pews on Wednesday when a shooter fired through the windows of Annunciation Catholic Church during an all-school Mass. In addition to the two children who were killed, 17 people were injured, 14 of them children.

Experts say that children who survive school shootings deal with a host of complex feelings, ranging from anxiety and grief to guilt and shame.