A coal mine fire in central China has killed 25 people, state-run media cited local government as saying.

Cables caught fire Monday night in Xinmi City in Zhengzhou, the capital of central Henan province, the information office of the Zhengzhou city government said, according to Xinhua.

A rescue operation that ended at about 2 a.m. Tuesday (2 p.m. Monday ET) saved six miners. All miners have been accounted for.

An initial investigation showed the mine was in operation legally, Xinhua reported.

At least three mine managers have been detained, and authorities have frozen their and the mine's assets, according to Xinhua.