https://www.stripes.com/news/pacific/small-explosion-forces-lockdown-at-yokota-no-injuries-1.239767
Small explosion forces lockdown at Yokota; no injuries
YOKOTA AIR BASE, Japan — A small explosion outside a Yokota Air Base gate led the U.S. military to put the facility on lockdown Saturday morning and raise the alert level to Delta, the highest in the four-stage system. No injuries or damage were reported.
Base officials and Japanese National Police are investigating the cause of the incident, which occurred around 9 a.m. Youth soccer league games were abruptly canceled, and parents were told to take their children off the field.
The alert level was relaxed to Alpha around 11 a.m., and traffic in and out of the base resumed.