The Department of Environmental Quality has joined the probe of unrelated incidents this morning including a train derailment in Stone County and a suspicious item at the Pass Christian Post Office.
A train hauling cars with hazardous materials derailed around 6 a.m., with four cars coming off tracks between Perkinston and McHenry. First-responders evacuated less than a dozen nearby homes as a precaution.
Earl Etheridge, onsite coordinator for DEQ, said two of the cars contain flouride and sodium hydroxide.
"They're not leaking," Etheridge said.
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Cleanup is under way and the cause of the derailment is under investigation.
Etheridge was in Pass Christian at 8:20 a.m., waiting on the Gulfport Fire Department to arrive to check out a mail cart coated with a yellow powder that has a foul smell. The mail carts are hand-held trays used to hold letters.
The Sun Herald updates this stories as details develop.