Bay City News reports that an evacuation at Pier 96 in Bayview/Hunters Point happened a little after 6:30 a.m. this morning after "[a] box was going down a conveyor belt in the facility when it broke open and a white powder was released into the air."

More than a dozen people were treated for injuries, with one victim requiring additional treatment, "and was transported to a local hospital."

Folks from the U.S. Environmental Protection Agency, San Francisco Department of Public Health, and the city's fire and police departments are still trying to figure out what, exactly, was in the box.

The area was secured at 7:49 a.m.