( CNN ) -- Firefighting crews made some headway Monday against a wind-whipped wildfire in the Texas Panhandle . The Double Diamond Fire in Hutchinson County is now 65 % contained , up from 35 % earlier in the day , according to the Texas A & M Forest Service . The blaze has burned more than 2,500 acres and destroyed 160 structures , 91 of them homes , authorities said . It prompted at least 2,100 people to flee their homes , said Troy Ducheneaux of the Forest Service . Late Monday , about 400 people were still unable to return home , said Danny Richards , emergency management coordinator for Hutchinson County . Some areas remain risky because of downed power lines , he said . Paula Lea was one of the people who fled . `` It almost looked like a tornado -- I mean , just a tornado of smoke . And it was so thick and heavy , you just could n't breathe , '' said Lea , who spoke to CNN at a temporary shelter . She said her home survived , but her father-in-law 's house did not . A cold front raised humidity and was helping firefighting efforts . Richards said authorities were still tackling hotspots . The wildfire started late Sunday afternoon and was driven by strong , shifting winds . The cause has not been determined . The State Fire Marshal has been called in to assist the investigation , Richards said . Fast-moving wildfire burns at least 20 homes in Oklahoma . What to know about wildfires . CNN 's Joe Sutton , Ed Payne and Dave Alsup contributed to this report .
NEW : About 400 people are still unable to return to their homes , an official says . NE : The wildfire has destroyed 160 structures , most of them homes , officials say . The Double Diamond Fire is now 65 % contained . One woman described the fire as a ` ` cloud of smoke ''