Homeland Security To Release Harmless Gas In NYC Subway System For Bioterrorism Drill Prison Planet.com Posted on May 7, 2016 Posted in Aggregated No Comments Tagged with Featured Stories, Tile NY Daily News | The Department of Homeland Security will release “harmless particle materials” in the city’s subway system next week. Share this:Share Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Share on LinkedIn (Opens in new window) LinkedIn Email a link to a friend (Opens in new window) Email