Update March 19: The situation has been cleared and the chemical identified. News 2 has the latest.

First reporting:
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Around 6:30 this morning a package fell at a UPS facility in Summerville, spilling a white substance and raising fears that it could be toxic.

The facility and neighboring road has been closed.

A lot of folks are reporting on this, if I had to pick one report, I'd suggest the one at Live 5 News. See "more coverage" below for more reports.