Sunday, May 18, 2014 | 6:52 p.m.
Crews are being hampered by rugged terrain in their battle against a 100-acre wildfire in the north end of the Mt. Rose Wilderness Area near Reno.
Sierra Front Interagency spokeswoman Elizabeth Kenna says one helicopter crew is dropping water on the blaze while another helicopter crew is taking firefighters to the Carson Range roadless area around Hunter Creek.
She says no structures are threatened, but the fire is only 5 percent contained.
Some 100 firefighters have been sent to the blaze, which is burning timber on the Humboldt-Toiyabe National Forest.
The cause of the fire is under investigation.