The National Transportation Safety Board is sending investigators to west central Ohio March 6, after a Norfolk Southern freight train derailed there over the weekend, prompting calls to shelter in place before authorities announced the wreck was not hazardous and there was no environmental harm.

CNN reports that the derailment near Springfield, Ohio, just 1,000 feet from nearby homes, happened March 4, just one month after another Norfolk Southern train wreck across the state in East Palestine, Ohio, put the company under intense scrutiny over contamination that seeped into the small town.

The 212-car freight train was southbound through Clark County Saturday, en route to Birmingham, Alabama, when 28 of its cars derailed, downing large high tension power lines, knocking out power to some residents and temporarily prompting shelter-in-place orders to homes within 1,000 feet, authorities said.

The cause of the derailment remains under investigation, according to Norfolk Southern.

Crews have determined there were no spills from the derailed cars, officials said.

“There was no release of any chemical or any hazardous material to the soil, to the air, to the water,” Ohio Environmental Protection Agency Director Anne Vogel said March 5.