Four environmental activists were in jail Friday afternoon after staging a demonstration at Devon Energy Center in Oklahoma City.
About 9:45 a.m. Friday, two of the protesters chained themselves to a revolving door at the office tower. Others unfurled two banners and spread what appeared to be black powder on the floor of the lobby.
The black substance alarmed regular tower occupants, who called police and the fire department, officers said. The powder turned out to be harmless black glitter.
Moriah Stephenson, 27, of Oklahoma City, and Stefan Warner, 26, of Harrah, were arrested during the demonstration on complaints of terrorism hoax, trespassing and disorderly conduct.
Cory Mathis, 23, of Austin, Texas, and Caroline McNally, 22, of Simi Valley, Calif., were arrested on trespassing and disorderly conduct complaints. All four were being held at Oklahoma County jail Friday afternoon.
More than a dozen police cars responded to the scene. Police blocked off Sheridan Avenue on the south side of the building. Fire trucks, ambulances and a hazmat truck also responded.
Police initially said they detained 11 people in connection with the protest, but later released the other seven.