UPDATE @ 4:40PM: This information is from Metro 911: AS OF THIS TIME...METRO 911 HAS NOT RECEIVED ANY REPORTS OF PEOPLE EXPERIENCING ACUTE DISTRESS FROM CONTACT WITH THIS UNKNOWN SUBSTANCE. METRO 911 STILL HAS NOT BEEN NOTIFIED OF THE SOURCE OR ORIGIN...AND NO ONE HAS NOTIFIED METRO 911 THAT THEY HAVE HAD A LEAK OR RELEASE. AS SUCH...EMERGENCY OFFICIALS ARE NOT ADVISING A FORMAL SHELTER IN PLACE...BUT IT IS NOT RECOMMENDED TO VOLUNTARILY PROLONG EXPOSURE BECAUSE THE SUBSTANCE IS STILL UNKNOWN.