Federal and local authorities are holding a news conference about Tuesday's dramatic developments in the armed standoff at the Malheur National Wildlife Refuge outside Burns.

U.S. Attorney Bill Williams, FBI Special Agent in Charge Greg Bretzing and Harney County Sheriff Dave Ward will address reporters from the Harney County Chamber of Commerce at 11 a.m.

Kelly House of The Oregonian is live-tweeting from the news conference:

On Tuesday, Oregon standoff spokesman Robert "LaVoy" Finicum was killed and other leaders of the occupation were arrested after the FBI and state police stopped them about 20 miles north of Burns along U.S. 395.

In all, eight people were arrested Tuesday. They are: Ammon E. Bundy, 40, of Emmett, Idaho; his brother, Ryan C. Bundy of Bunkerville, Nevada; Ryan W. Payne, 32, of Anaconda, Montana; Jon Ritzheimer, 32, of Arizona; Brian Cavalier, 44, of Bunkerville, Nevada; Shawna J. Cox, 59, of Kanab, Utah; Joseph D. Oshaughnessy, 43, of Cottonwood, Arizona; and Peter T. Santilli, 50, of Cincinnati.

All but Ritzheimer, who surrendered to police in Arizona, are set to be arraigned at 1:30 p.m. Wednesday in U.S. District Court in Portland.

Police have set up roadblocks around the wildlife refuge. FBI officials have told those who are still at the bird sanctuary's compound that they are free to leave and should do so.

Les Zaitz of The Oregonian/OregonLive contributed to this report.

-- Rebecca Woolington

503-294-4049; @rwoolington