AUSTIN, Texas—When police were hunting two snipers terrorizing Washington, D.C., in 2002, school children were kept inside during recess. In Boston, the entire city was placed on lockdown in 2013 as police searched for the bombers who had struck the marathon. During a serial killer’s spree last year in Tampa, Fla., police escorted children...

Source: Wall Street Journal March 20, 2018 16:41 UTC