(HAVELOCK) -- Efforts to contain a wildlife in the Croatan National Forest are showing some success. Don Simon with the U.S. Forest Service says a containment line appears to be holding.

"We're pretty close to containing it, as long as weather conditions stay with us and the fire doesn't jump this fire line, we feel pretty good about where we're going with controlling this wildfire.

The Forest Service lit a prescribed burn in the 160,000-acre forest last week; the fire has since burned more that 21,000 acres. Simon says, for now, no private property is at risk.

"Nothing is threatened right now, which we are very grateful for. It's all National Forest property, a lot of it is wilderness property ... areas that we might prescribe fires for, anyway ... so it's burning in there, we're trying to contain it, so there's no nobody is threatened, [including] firefighters and the public."

A congressman from North Carolina is now inquiring to how the prescribed burn jumped it's initial containment lines. U.S. Rep. Walter Jones wrote the supervisor of the U.S. Forest Service in North Carolina, asking for an investigation of the prescribed burn that led to the fire. Jones says he's concerned that the fire is hurting tourism and public health.

Smoke from the blaze has prompted the state Division of Air Quality to issue a Code Red advisory for portions of Craven, Jones and Pamlico counties, and a Code Orange warning for Beaufort, Craven, Hyde, Jones, Martin, Pamlico, Pitt, Jones and Washington counties.