The fight started around 5:15 p.m. but was quickly brought under control, she said. The prison was locked down, she said.
"At no time was there any threat to the community," she said.
The prison has about 1,400 inmates; there are also low- and high-security prisons on the site. The prison sits in a sparsely populated area 10 miles south of South Williamsport, where the Little League World Series is played.