Ammon Bundy, leader of the group of militants that has occupied an Oregon wildlife refuge for weeks, has been arrested along with four other members of the group, according to a law enforcement statement.

The FBI and Oregon State Police arrested the five in an operation that began at 4:25 p.m. local time and resulted in the shooting death of an unnamed sixth member of the group. Two other members of the group were arrested separately.

Authorities listed the sixth arrested as ranging in age from 32 to 59; all are from Western states other than Oregon.

This post was updated at 10 p.m. ET

The stage is set for Thursday's Fox News Channel final debate ahead of the Iowa caucuses — but front-runner Donald Trump won't be there.

After teasing earlier Tuesday evening that he "probably won't bother" with the debate, Trump's campaign confirmed he won't participate, citing unfair treatment from the network:

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So, a Twitter spat between astrophysicist Neil deGrasse Tyson and rapper B.o.B over the flat Earth theory has turned into a full-blown rap battle (and it's way better than Drake vs. Meek Mill).

The outbreak of Zika virus in Brazil and other countries has raised concern that the pathogen could start spreading widely in the United States, as well. But federal health officials and other infectious disease specialists say so far that seems unlikely.