An evacuation order around an industrial plant in East Peoria, Illinois, was lifted Tuesday after police bomb technicians dealt with a device that authorities had labeled a credible threat, the city of East Peoria announced.

The city said residents "can return to their homes and all businesses can resume normal operations." The all-clear came after Peoria police described the situation as a "credible threat," a term departments reserve for tips or items they believe could cause real harm rather than pranks or hoaxes.

Police Chief Brad Dixon said investigators had "no explanation on what the device was," leaving the public without a stated motive or confirmed description of the item that triggered the response. It was not immediately clear how long the evacuation lasted or how many people were moved out.

Bomb threats against industrial sites carry heightened stakes because plants often store chemicals, fuels or pressurized equipment that can turn a small blast into a much larger hazard. That is why departments typically clear a wide perimeter first and ask questions later, treating any suspicious package as live until technicians render it safe.

East Peoria sits directly across the Illinois River from Peoria, and the two cities share a dense corridor of manufacturing, rail and river barge traffic. The Peoria Police Department's involvement in the response reflects how the metro area's law enforcement agencies routinely assist one another on major incidents.

Federal statistics show bomb threats are a persistent problem nationally. The Bureau of Alcohol, Tobacco, Firearms and Explosives tracks hundreds of bombing and explosives incidents each year, and the FBI and ATF both maintain national databases of bombing and arson cases that local departments feed into after incidents like this one.

Authorities did not say whether anyone was detained or whether they had identified a suspect. The investigation into who placed the device, and why, is expected to continue after the streets reopened.

Anyone with information about the device or the threat is asked to contact Peoria or East Peoria police directly.