US Naval base on lockdown over bomb threat and active shooter investigation

US Naval Support Activity Bethesda in Maryland was on lockdown on Wednesday due to a bomb threat and an active shooter investigation, the naval base said on Twitter.

All personnel were ordered to shelter in place after the base received an anonymous phone call around 08:45 saying there was a bomb at or near the site, the base said.

NSA Bethesda houses Walter Reed National Military Medical Center.