The remote high desert of eastern Oregon became the latest flashpoint for anti-government sentiment as armed protesters occupied a national wildlife refuge to object to a prison sentence for local ranchers for burning federal land.

Ammon Bundy — the son of Nevada rancher Cliven Bundy, who was involved in a 2014 standoff with the government over grazing rights — is among the people at the headquarters of the Malheur National Wildlife Refuge. It was unclear exactly how many people were taking part in the protests.

Ammon Bundy posted a video on his Facebook page asking for militia members to come help him. He said "this is not a time to stand down. It's a time to stand up and come to Harney County," where Burns is located.

Bundy and other militia members came to Burns last month, a small town about 451 kilometres southeast of Portland, Ore. They were upset over the looming prison sentences for local ranchers Dwight and Steven Hammond. They went to the wildlife refuge Saturday evening following a peaceful rally in Burns to support the ranchers.

Ammon Bundy

Ammon Bundy, the son of Nevada rancher Cliven Bundy, is one of a group of people occupying the headquarters of the Malheur National Wildlife Refuge. (Les Zaitz/The Oregonian/Associated Press)

Bundy told CNN in a phone interview on Sunday that some of the occupiers were armed, Reuters reported.

"We have no intention of using force or being aggressive or going on the offence, but just as all people have the right to defend themselves, that's exactly what that meant — means."

Want land turned over to local authorities

Dwight Hammond, 73, and Steven Hammond, 46, said they lit the fires on federal land in 2001 and 2006 to reduce the growth of invasive plants and protect their property from wildfires.

The two were convicted of the arsons three years ago and served time — the father three months, the son one year. But a federal judge ruled in October that their terms were too short under U.S. minimum sentencing law and ordered them back to prison for about four years each.

The decision generated controversy and is part of a decades-long dispute between some Westerners and the federal government over the use of public lands. The issue traces back to the 1970s and the Sagebrush Rebellion, a move by Western states like Nevada to increase local control over federal land. Critics of the push for more local control have said the federal government should administer the public lands for the widest possible uses, including environmental and recreation.

In an interview with The Associated Press at the wildlife refuge Sunday, Ryan Bundy, Ammon Bundy's brother, said the protesters' ultimate goal is to turn the land over to local authorities so people can use it free of federal oversight.

They want to "restore the rights to people so they can use the land and resources" for ranching, logging, mining and recreation.

Ryan Bundy says the federal government has been "tromping on people's rights and privileges and properties and livelihoods."

"I understand the land needs to be used wisely, but that's what we as stewards need to do. A rancher is going to take care of his own ranch," Ryan Bundy said.

On Sunday, supplies were seen being delivered to the refuge area, which is remote even by rural Oregon standards.

Hammond and his son, convicted in 2012 of setting fires that spread to public land, travelled to Los Angeles on Sunday evening to turn themselves in to federal authorities, according to their lawyer W. Alan Schroeder.

Some locals fear potential of violence

Harney County Sheriff Dave Ward said the group of armed protesters came to town under false pretenses.

"These men came to Harney County claiming to be part of militia groups supporting local ranchers, when in reality these men had alternative motives to attempt to over throw the county and federal government in hopes to spark a movement across the United States," Ward said in a statement on Sunday afternoon.

Ranching Standoff Protest

Protesters march in support of Oregon ranchers facing prison time for arson in Burns, Ore., on Jan. 2. (Les Zaitz/The Oregonian/Associated Press)

The sheriff says he is working with local and federal authorities to keep the citizens in his county safe and to resolve the situation as quickly and peacefully as possible.

He is asking people to stay away from the Malheur National Wildlife Refuge for their own safety. He said he does not think any other parts of the county are in immediate danger.

Beth Anne Steele, an FBI spokeswoman in Portland, said Saturday that the agency was aware of the situation at the national wildlife refuge. She made no further comment.

U.S. Senator Ron Wyden, who had been briefed by the FBI agent in charge in Portland, Ore., said most local residents do not support the protesters.

"The overwhelming majority of people there very much want to get on with their lives without this disruption and are not in sympathy with a bunch of outsiders," Wyden said.

Local residents have expressed fear of potential of violence. A peaceful rally Saturday in support of the Hammonds featured speeches, flags and marching.

As marchers reached the courthouse, they tossed hundreds of pennies at the locked door. Their message: Civilians were buying back their government. After the march passed, two girls swooped in to scavenge the pennies.

A few blocks away, Hammond and his wife, Susan, greeted marchers, who planted flower bouquets in the snow. They sang some songs, Hammond said a few words, and the protesters marched back to their cars.​

Malheur national wildlife refuge

With files from Reuters