Although the circumstances are still under investigation, authorities said the family was walking on the train tracks when the accident happened.

At least two adults are dead, one toddler is injured, and a young child is missing after a train struck several pedestrians on a railroad bridge in Fremont, Ohio, the mayor said.

The National Transportation Safety Board was involved immediately, Zimmerman said. “The NTSB was here pretty quickly; they knew it when the train stopped," he said.