SPRINGFIELD, IL (KTRS) Emergency workers wearing protective gear have entered Gov. Bruce Rauner’s office inside the Illinois Capitol after a report of hazardous material that’s prompted authorities to block anyone from entering or exiting the building. The investigation has delayed Thursday’s critical override vote on a package of bills that could end the state’s budget impasse.

Springfield fire officials say the Capitol is on lockdown after a woman allegedly threw a powdery substance in Gov. Rauner’s office. No injuries have been reported. The governor’s office says Rauner wasn’t at the Capitol Thursday.

Dave Druker, a spokesman for the Secretary of State’s office, which oversees Capitol security, said one person was taken into custody Thursday. He did not have further details.