https://apnews.com/832a2dbe4e1b49dbbf8e85c4deff50e3

SPOKANE, Wash. (AP) — Some workers at a nuclear weapons production site in Washington state were ordered to stay inside Friday because steam escaped from a tunnel with radioactive waste as it was being filled with cement, officials said.

There no indication that the steam seen at the Hanford Nuclear Reservation contained radiation or any other hazardous material, and the workers were ordered inside as a precaution, the U.S. Department of Energy said in a statement.