According to the agency, one of the occupiers rode an ATV outside the barricades established by the militia. When the FBI tried to approach the driver, he sped back, the agency said.
The FBI said that it had secured barricades both in front of and behind where the occupiers are camping.
Occupier Sean Anderson said he spoke with the FBI and that he and three other holdouts agreed to turn themselves in at an FBI checkpoint at 8 a.m. today. Anderson said they would leave their weapons in their vehicles and walk to a checkpoint established nearby, carrying an American flag.
Anderson relayed the information to Nevada lawmaker Michele Fiore over a phone line streaming online. He said he expects Fiore to meet him and his fellow occupiers at the checkpoint today when they turn themselves in.
Meanwhile, Cliven Bundy, father of Ammon Bundy - the leader of the wildlife refuge occupation - was arrested by FBI officials. The Bundy Ranch posted on Facebook earlier Wednesday that Cliven Bundy was on his way to the Malheur Wildlife Refuge.
He was at the center of a standoff with federal officials in 2014 in Nevada, over the use of public lands.