Megan Verlee

It's Sunday evening, and services are just getting underway at the House for All Sinners and Saints in Denver. Nearly 200 worshipers sit in circles of plastic chairs around a simple altar table. Together they follow traditional Christian rites. They sit. They stand. They sing.

A student armed with a shotgun opened fire at a Colorado high school, Arapahoe County Sheriff Grayson Robinson said Friday. Police said the shooter injured two fellow students at Arapahoe High School in Centennial, Colo., before killing himself.