AINSWORTH, Neb. (AP) — Officials say more fire crews have been sent to help battle flames that have blackened thousands of acres in north-central Nebraska.

Susan Ford is spokeswoman for a federal interagency management team that’s been dispatched to help local and state agencies with the wildfire in Keya Paha  County. Ford said Monday that three more ground crew teams of about 20 firefighters each are expected on the lines soon, replacing some local volunteers.

Winds gusting to 30 mph are expected to fan the flames.

Ford says an overnight aerial survey using infrared technology provided officials with an updated estimate of about 50,000 acres burned, compared with previous estimates approaching 100,000 acres. She couldn’t confirm a previous estimate that the fire was about 50 percent contained.

No injuries have been reported.