A potentially hazardous material found on the Oklahoma state Capitol grounds prompted a response from the Oklahoma City Fire Department’s hazardous materials team and Oklahoma Highway Patrol on Tuesday, Oct. 13, 2026. The material was undergoing testing, OHP said. Authorities had not identified it or described where on the Capitol grounds it was found. No one was adversely affected, according to OHP. Firefighters and troopers were at the scene as the hazmat crew responded. The test results and any further response had not been announced as of Tuesday afternoon.