The start of Thursday afternoon's highly anticipated Illinois House session to vote on an override of Gov. Bruce Rauner's veto of a state budget plan was delayed for more than two hours as authorities investigated a powdery substance that was tossed into several locations in the Capitol.

The powder, which was tossed into the governor's office and other locations, turned out to be not hazardous, said the Secretary of State's Office, which oversees Capitol security. Dave Druker, a spokesman for the Secretary of State, said a woman was taken into custody. Her name was not immediately released.

The call about the powder came in around 1:30 p.m., the same time the House was to convene. The building was put on lockdown. It was not evacuated, but people who were inside had to stay inside and others were not allowed in. The building was reopened about 3:25 p.m. The House reconvened at 3:40 p.m.

The Capitol's air-conditioning system was shut off during the lockdown to not further disperse the substance, Springfield Fire Chief Barry Helmerichs said. Workers in protective suits were seen inside the governor's office and other locations investigating and collecting the substance.

No injuries were reported and it remained calm inside the building during the lockdown, said Chris Richmond, the Springfield Fire Department fire marshal.

Rauner was not in the building during the incident, his staff said.