In St. Louis, the players who wear No. 26 — Rams running back Daryl Richardson and Vikings cornerback Antoine Winfield — joined hands in a circle with their coaches at midfield before their game, surrounded by dozens of children wearing jerseys.
"I have a son that's in kindergarten. It choked me up because I would hate to be one of those parents," Rams running back Steven Jackson said. "You drop your kid off at school and he or she wants to go there and learn and better themselves, and to then go to the school and find that your child will no longer be with you. I couldn't imagine that thing."
Flags were also at half-staff in Baltimore, where the scoreboards went black as the public address announcer asked the crowd at the game between the Ravens and Denver Broncos to observe "silent reflection" in the wake of Friday's "horrific tragedy."
"As a parent you drop your kids off at school many times," said Miami Dolphins coach Joe Philbin, whose 21-year-old son Michael fell into a Wisconsin river and drowned in January. "It's hard to put into words what that community and those families must feel like. We obviously kept them in our prayers."
A moment of silence was observed at all 14 NFL games on Sunday; in Houston and in Arlington, Texas, the scoreboard went black. Members of the Buffalo Bills and Seattle Seahawks stood quietly with their heads down on their sideline while fans stood silently at the Rogers Centre in Toronto.
The Bills did continue their pregame habit of playing U2's "Sunday Bloody Sunday," which they've played before every home game this season. The song is in reference to British troops shooting and killing unarmed protesters in Derry, Northern Ireland in January 1972.