Police have arrested someone who allegedly threw a military flare on a southeastern Wisconsin meatpacking plant, causing a massive fire and an evacuation of thousands of residents.

One male has been arrested and one other suspect has been located in another state, but police wouldn't provide any other details at a Thursday news conference. Milwaukee County's chief deputy district attorney, Kent Lovern, says they can be charged as adults, but no charges have been filed.

The flare ignited the Patrick Cudahy Inc. plant on the night of July 5. The blaze lasted for days and caused an estimated $50 million or more in damages.

It also prompted a temporary evacuation of thousands of area residents.

Cudahy is a town of about 18,000 just south of downtown Milwaukee.