Update at 5:00 p.m. — “This occurred outside the bank near the ATM in the mall,” Arlington Police spokeswoman Det. Crystal Nosal tells ARLnow.com. “It does not appear to be hazardous at this time and was not a robbery or attempted bank robbery.”
Update at 4:20 p.m. — We’re told that tests have revealed the substance to be “non-hazardous.” At least one patient was transported to the hospital, however.