The examination concerning the blast Wednesday around 6 p.m. at the office in East Chicago “stays open and dynamic,” the organization said in an announcement, asking general society to approach with tips.
The FBI said it was “all the while endeavoring to determine if there are any fear mongering joins” to the impact.
East Chicago Fire Chief Anthony Serna said the female postal specialist’s wounds were not hazardous.
Neighborhood law requirement additionally aided the examination. The Porter County’s bomb squad reacted with a bomb transfer robot. K-9 units from the Lake County Sheriff’s Department were at the scene.
A roadway close to the mail station was closed off as specialists examined. East Chicago is around 20 miles (30 kilometers) southeast of Chicago.