[Source]

Excerpt below. Also, this is from his twitter :

I'm sure this misunderstanding will clear up in no time:

Jonathan "War Machine" Koppenhaver, 32, was taken into custody about 1:45 p.m. in Simi Valley by police at the request of the U.S. Marshals Service.

An arrest warrant had been issued for Koppenhaver stemming from an incident in Las Vegas last week, according to police.

A former Simi Valley resident, Koppenhaver was found at the Extended Stay America Hotel located at 2498 Stearns St., just off the 118 Freeway, according to the Simi Valley Police Department.

Inside the room was "a small quantity of cash and some pizza," a police news release stated.