Published: Mar 29, 2013 5:16 PM EDT

HERNANDO COUNTY, Fla.- A 200-acre controlled burn that extended outside of its original fire lines near the Glen Lake subdivision, has now burned 550 acres.

The Florida Forest Service is fighting now, and plowing some new fire lines to contain the flames.

There are no mandatory evacuations or road closures, and fire officials say they do not believe any homes are threatened by the flames.

Smoke could cause problems on US 19 later tonight.